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docsify/docs/install/kubernetes.md

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新增: 初始化提交
7 months ago
# KUBERNETES 部署
## 主机规划
网段
```shell
192.168.127.0/24
```
主机 IP
```shell
192.168.127.05 bastion
192.168.127.10 ha vip
192.168.127.11 ha1
192.168.127.12 ha2
192.168.127.13 master01
192.168.127.14 master02
192.168.127.15 master03
192.168.127.21 worker01
192.168.127.22 worker02
```
## 通用节点环境配置
IP 地址
```shell
vi /etc/sysconfig/network-scripts/ifcfg-ens33
```
```shell
BOOTPROTO = static
ONBOOT=yes
NM_CONTROLLED=no
NETMASK=255.255.255.0
GATEWAY=192.168.127.1
DNS1=192.168.127.1
IPADDR=192.168.127.xx
UUID=<UUID>
```
关闭网络管理服务
```
systemctl stop NetworkManager
systemctl disable NetworkManager
```
重启服务
```shell
systemctl restart network
```
YUM 源
```shell
curl -o /etc/yum.repos.d/CentOS-Base.repo https://repo.huaweicloud.com/repository/conf/CentOS-7-reg.repo
yum clean all
yum makecache
yum update -y
```
常用工具
```shell
yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git lrzsz -y
```
升级系统内核
```shell
yum -y install perl
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
yum -y install https://www.elrepo.org/elrepo-release-7.0-4.el7.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel -y install kernel-ml.x86_64
grub2-set-default 0
grub2-mkconfig -o /boot/grub2/grub.cfg
reboot
```
查看内核版本
```shell
cat /proc/version
```
关闭防火墙
```shell
systemctl stop firewalld
systemctl disable firewalld
systemctl status firewalld
```
关闭 selinux
```shell
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
getenforce
```
关闭 swap 分区
```shell
swapoff -a
sed -ri 's/.*swap.*/#&/' /etc/fstab
```
时区
```shell
timedatectl set-timezone Asia/Shanghai
```
日期同步服务
```shell
yum install ntpdate -y
```
定时同步时间
```shell
crontab -e
* * * * * /usr/sbin/ntpdate time1.aliyun.com
```
重启定时任务
```shell
systemctl restart crond
systemctl enable crond
```
查看当前时间
```
date
```
主机系统优化
```shell
ulimit -SHn 65535
cat >> /etc/security/limits.conf <<'EOF'
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited
EOF
```
主机名解析
```shell
cat >> /etc/hosts <<'EOF'
192.168.127.5 bastion
192.168.127.11 ha01
192.168.127.12 ha02
192.168.127.13 master01
192.168.127.14 master02
192.168.127.15 master03
192.168.127.21 worker01
192.168.127.22 worker02
192.168.127.23 worker03
EOF
```
免密登录
生成秘钥
```shell
ssh-keygen
```
分发秘钥
```shell
ssh-copy-id root@bastion
ssh-copy-id root@ha01
ssh-copy-id root@ha02
ssh-copy-id root@master01
ssh-copy-id root@master02
ssh-copy-id root@master03
ssh-copy-id root@worker01
ssh-copy-id root@worker02
ssh-copy-id root@worker03
```
验证连接
```shell
ssh root@bastion
ssh root@ha01
ssh root@ha02
ssh root@master01
ssh root@master02
ssh root@master03
ssh root@worker01
ssh root@worker02
ssh root@worker03
```
设置主机名
```shell
hostnamectl set-hostname xxxx
```
环境配置检查
检查 NetworkManager 状态
```shell
systemctl status NetworkManager
```
检查 selinux 状态
```shell
getenforce
```
检查 swap 分区状态
```shell
free -m
```
检查时间同步状态
```shell
date
```
## HA节点环境配置
安装 haproxy 与 keepalived
```shell
yum -y install haproxy keepalived
```
HAProxy 配置
```shell
cat > /etc/haproxy/haproxy.cfg <<'EOF'
global
maxconn 2000
ulimit-n 16384
log 127.0.0.1 local0 err
stats timeout 30s
defaults
log global
mode http
option httplog
timeout connect 5000
timeout client 50000
timeout server 50000
timeout http-request 15s
timeout http-keep-alive 15s
frontend monitor-in
bind *:33305
mode http
option httplog
monitor-uri /monitor
frontend master
bind 0.0.0.0:6443
bind 127.0.0.1:6443
mode tcp
option tcplog
tcp-request inspect-delay 5s
default_backend master
backend master
mode tcp
option tcplog
option tcp-check
balance roundrobin
default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
server master01 192.168.127.13:6443 check
server master02 192.168.127.14:6443 check
server master03 192.168.127.15:6443 check
EOF
```
KeepAlived
健康检查脚本
```shell
cat > /etc/keepalived/check_apiserver.sh <<'EOF'
#!/bin/bash
err=0
for k in $(seq 1 3)
do
check_code=$(pgrep haproxy)
if [[ $check_code == "" ]]; then
err=$(expr $err + 1)
sleep 1
continue
else
err=0
break
fi
done
if [[ $err != "0" ]]; then
echo "systemctl stop keepalived"
/usr/bin/systemctl stop keepalived
exit 1
else
exit 0
fi
EOF
```
```shell
chmod +x /etc/keepalived/check_apiserver.sh
```
> 主从配置不一致，需要注意。
主节点配置
```shell
cat >/etc/keepalived/keepalived.conf<<"EOF"
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
script_user root
enable_script_security
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state MASTER
interface ens33
mcast_src_ip 192.168.127.11
virtual_router_id 11
priority 100
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.127.10
}
track_script {
chk_apiserver
}
}
EOF
```
备节点配置
```shell
cat >/etc/keepalived/keepalived.conf<<"EOF"
! Configuration File for keepalived
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
script_user root
enable_script_security
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
mcast_src_ip 192.168.127.12
virtual_router_id 11
priority 99
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.127.10
}
track_script {
chk_apiserver
}
}
EOF
```
启动服务并验证
```shell
systemctl daemon-reload
systemctl enable haproxy
systemctl restart haproxy
systemctl enable keepalived
systemctl restart keepalived
```
```shell
ip address show
```
## 集群节点环境配置
创建路径
```shell
mkdir -p /etc/kubernetes/ssl
mkdir -p /var/log/kubernetes
```
安装 IPVS 模块
```shell
yum -y install ipvsadm ipset sysstat conntrack libseccomp
```
开启 IPVS 模块
```shell
cat >/etc/modules-load.d/ipvs.conf <<EOF
ip_vs
ip_vs_lc
ip_vs_wlc
ip_vs_rr
ip_vs_wrr
ip_vs_lblc
ip_vs_lblcr
ip_vs_dh
ip_vs_sh
ip_vs_fo
ip_vs_nq
ip_vs_sed
ip_vs_ftp
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
EOF
```
开启 containerd 相关模块
```shell
cat > /etc/modules-load.d/containerd.conf <<'EOF'
overlay
br_netfilter
EOF
```
开机自启动
```shell
systemctl daemon-reload
systemctl enable systemd-modules-load
systemctl restart systemd-modules-load
```
内核优化
```shell
cat > /etc/sysctl.d/k8s.conf <<'EOF'
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 131072
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
EOF
```
应用配置
```shell
sysctl --system
```
重启
```shell
reboot
```
检查模块
```shell
lsmod | grep -e ip_vs -e nf_conntrack_ipv4
```
## 软件下载
> 在 bastion 上操作
切换工作路径
```shell
cd /usr/local/
```
下载
```shell
wget https://dl.k8s.io/v1.24.16/kubernetes-server-linux-amd64.tar.gz
```
解压
```shell
tar -xvf kubernetes-server-linux-amd64.tar.gz
```
切换工作路径
```shell
cd /usr/local/kubernetes/server/bin/
```
kubectl 安装
```shell
cp kubectl /usr/local/bin/
```
> 控制节点分发
```shell
for i in master{01,02,03}; \
do \
scp kube-apiserver kubectl kube-controller-manager kube-scheduler $i:/usr/local/bin/ ;\
done
```
> 工作节点分发
```shell
for i in worker{01,02,03}; \
do \
scp kubelet kube-proxy $i:/usr/local/bin/ ;\
done
```
## 配置证书
> 在 bastion 上操作
切换工作路径
```shell
cd /usr/local/kubernetes/
mkdir master{01,02,03}
mkdir worker{01,02,03}
```
CFSSL 证书工具
```shell
# cert cli
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
# cert json output
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
# cert info view
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
```
```shell
chmod +x cfssl*
```
```shell
mv /usr/local/kubernetes/cfssl_linux-amd64 /usr/local/bin/cfssl
mv /usr/local/kubernetes/cfssljson_linux-amd64 /usr/local/bin/cfssljson
mv /usr/local/kubernetes/cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo
```
```shell
cfssl version
```
CA 证书配置
```shell
cat > ca-csr.json <<'EOF'
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "kubemsb",
"OU": "CN"
}
],
"ca": {
"expiry": "87600h"
}
}
EOF
```
CA 证书
```shell
cfssl gencert -initca ca-csr.json | cfssljson -bare ca
```
CA 证书策略
```shell
cat > /usr/local/kubernetes/ca-config.json <<'EOF'
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "87600h"
}
}
}
}
EOF
```
## 配置 ETCD
> 在 控制节点 上操作
```shell
mkdir -p /etc/etcd/ssl
mkdir -p /var/lib/etcd/default.etcd
mkdir -p /root/.kube
```
> 在 bastion 上操作
ETCD 证书配置
```shell
cat > etcd-csr.json <<'EOF'
{
"CN": "etcd",
"hosts": [
"127.0.0.1",
"192.168.127.13",
"192.168.127.14",
"192.168.127.15"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "kubemsb",
"OU": "CN"
}]
}
EOF
```
ECTD 证书
```shell
cfssl gencert \
-ca=ca.pem -ca-key=ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
etcd-csr.json | \
cfssljson \
-bare
etcd
```
安装包下载
```shell
wget https://github.com/etcd-io/etcd/releases/download/v3.5.2/etcd-v3.5.2-linux-amd64.tar.gz
```
安装包解压
```shell
tar -zxvf etcd-v3.5.2-linux-amd64.tar.gz
```
控制节点分发
```
for i in master{01,02,03}; \
do \
scp etcd-v3.5.2-linux-amd64/etcd* $i:/usr/local/bin/ ;\
done
```
ETCD 配置模板
```shell
cat > etcd.conf.tmpl <<'EOF'
#[Member]
ETCD_NAME="$ETCDNAME"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://$HOSTNAME:2380"
ETCD_LISTEN_CLIENT_URLS="https://$HOSTNAME:2379,http://127.0.0.1:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://$HOSTNAME:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://$HOSTNAME:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://$HOSTNAME1:2380,etcd02=https://$HOSTNAME2:2380,etcd03=https://$HOSTNAME3:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
```
ETCD 配置
```shell
sed -e "s|\$HOSTNAME1|192.168.127.13|g" \
-e "s|\$HOSTNAME2|192.168.127.14|g" \
-e "s|\$HOSTNAME3|192.168.127.15|g" \
-e "s|\$ETCDNAME|etcd01|g" \
-e "s|\$HOSTNAME|192.168.127.13|g" \
etcd.conf.tmpl > master01/etcd.conf
sed -e "s|\$HOSTNAME1|192.168.127.13|g" \
-e "s|\$HOSTNAME2|192.168.127.14|g" \
-e "s|\$HOSTNAME3|192.168.127.15|g" \
-e "s|\$ETCDNAME|etcd02|g" \
-e "s|\$HOSTNAME|192.168.127.14|g" \
etcd.conf.tmpl > master02/etcd.conf
sed -e "s|\$HOSTNAME1|192.168.127.13|g" \
-e "s|\$HOSTNAME2|192.168.127.14|g" \
-e "s|\$HOSTNAME3|192.168.127.15|g" \
-e "s|\$ETCDNAME|etcd03|g" \
-e "s|\$HOSTNAME|192.168.127.15|g" \
etcd.conf.tmpl > master03/etcd.conf
```
ETCD 服务配置
```shell
cat > etcd.service <<'EOF'
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=notify
EnvironmentFile=-/etc/etcd/etcd.conf
WorkingDirectory=/var/lib/etcd/
ExecStart=/usr/local/bin/etcd \
--cert-file=/etc/etcd/ssl/etcd.pem \
--key-file=/etc/etcd/ssl/etcd-key.pem \
--trusted-ca-file=/etc/etcd/ssl/ca.pem \
--peer-cert-file=/etc/etcd/ssl/etcd.pem \
--peer-key-file=/etc/etcd/ssl/etcd-key.pem \
--peer-trusted-ca-file=/etc/etcd/ssl/ca.pem \
--peer-client-cert-auth \
--client-cert-auth
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
```
控制节点分发
```shell
for i in master{01,02,03}; \
do \
scp ca*.pem etcd*.pem $i:/etc/etcd/ssl/ ;\
scp etcd.service $i:/etc/systemd/system/ ;\
scp $i/etcd.conf $i:/etc/etcd/ ;\
done
```
## 部署 ETCD
> 在 控制节点 上操作
启动集群
```shell
systemctl daemon-reload
systemctl enable etcd
systemctl restart etcd
systemctl status etcd
```
验证状态
```shell
ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://192.168.127.13:2379,https://192.168.127.14:2379,https://192.168.127.15:2379 endpoint health
```
检查性能
```shell
ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://192.168.127.13:2379,https://192.168.127.14:2379,https://192.168.127.15:2379 check perf
```
成员列表
```shell
ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://192.168.127.13:2379,https://192.168.127.14:2379,https://192.168.127.15:2379 member list
```
集群状态
```shell
ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://192.168.127.13:2379,https://192.168.127.14:2379,https://192.168.127.15:2379 endpoint status
```
## 配置 API-SERVER
> 在 bastion 上操作
证书配置
```shell
cd /usr/local/kubernetes
cat > /usr/local/kubernetes/kube-apiserver-csr.json << 'EOF'
{
"CN": "kubernetes",
"hosts": [
"127.0.0.1",
"192.168.127.10",
"192.168.127.11",
"192.168.127.12",
"192.168.127.13",
"192.168.127.14",
"192.168.127.15",
"192.168.127.16",
"192.168.127.17",
"192.168.127.18",
"192.168.127.19",
"192.168.127.20",
"192.168.127.22",
"192.168.127.23",
"192.168.127.24",
"192.168.127.25",
"192.168.127.26",
"192.168.127.27",
"192.168.127.28",
"192.168.127.29",
"10.96.0.1",
"kubernetes",
"kubernetes.default",
"kubernetes.default.svc",
"kubernetes.default.svc.cluster",
"kubernetes.default.svc.cluster.local"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "kubemsb",
"OU": "CN"
}
]
}
EOF
```
API-SERVER 证书
```shell
cfssl gencert -ca=ca.pem \
-ca-key=ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
kube-apiserver-csr.json | \
cfssljson \
-bare \
kube-apiserver
```
API-SERVER TOKEN
```shell
cat > token.csv << EOF
$(head -c 16 /dev/urandom | od -An -t x | tr -d ' '),kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF
```
API-SERVER 配置模板
```shell
cat > /usr/local/kubernetes/kube-apiserver.conf.tmpl <<'EOF'
KUBE_APISERVER_OPTS="--enable-admission-plugins=NamespaceLifecycle,NodeRestriction,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota \
--anonymous-auth=false \
--bind-address=$HOSTNAME \
--secure-port=6443 \
--advertise-address=192.168.127.10 \
--authorization-mode=Node,RBAC \
--runtime-config=api/all=true \
--enable-bootstrap-token-auth \
--service-cluster-ip-range=10.96.0.0/16 \
--token-auth-file=/etc/kubernetes/token.csv \
--service-node-port-range=30000-32767 \
--tls-cert-file=/etc/kubernetes/ssl/kube-apiserver.pem \
--tls-private-key-file=/etc/kubernetes/ssl/kube-apiserver-key.pem \
--client-ca-file=/etc/kubernetes/ssl/ca.pem \
--kubelet-client-certificate=/etc/kubernetes/ssl/kube-apiserver.pem \
--kubelet-client-key=/etc/kubernetes/ssl/kube-apiserver-key.pem \
--service-account-key-file=/etc/kubernetes/ssl/ca-key.pem \
--service-account-signing-key-file=/etc/kubernetes/ssl/ca-key.pem \
--service-account-issuer=api \
--etcd-cafile=/etc/etcd/ssl/ca.pem \
--etcd-certfile=/etc/etcd/ssl/etcd.pem \
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \
--etcd-servers=https://$HOSTNAME1:2379,https://$HOSTNAME2:2379,https://$HOSTNAME3:2379 \
--allow-privileged=true \
--apiserver-count=3 \
--audit-log-maxage=30 \
--audit-log-maxbackup=3 \
--audit-log-maxsize=100 \
--audit-log-path=/var/log/kube-apiserver-audit.log \
--event-ttl=1h \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/var/log/kubernetes \
--v=4"
EOF
```
API-SERVER 配置
```shell
sed -e "s|\$HOSTNAME1|192.168.127.13|g" \
-e "s|\$HOSTNAME2|192.168.127.14|g" \
-e "s|\$HOSTNAME3|192.168.127.15|g" \
-e "s|\$HOSTNAME|192.168.127.13|g" \
kube-apiserver.conf.tmpl > master01/kube-apiserver.conf
sed -e "s|\$HOSTNAME1|192.168.127.13|g" \
-e "s|\$HOSTNAME2|192.168.127.14|g" \
-e "s|\$HOSTNAME3|192.168.127.15|g" \
-e "s|\$HOSTNAME|192.168.127.14|g" \
kube-apiserver.conf.tmpl > master02/kube-apiserver.conf
sed -e "s|\$HOSTNAME1|192.168.127.13|g" \
-e "s|\$HOSTNAME2|192.168.127.14|g" \
-e "s|\$HOSTNAME3|192.168.127.15|g" \
-e "s|\$HOSTNAME|192.168.127.15|g" \
kube-apiserver.conf.tmpl > master03/kube-apiserver.conf
```
API-SERVER 服务配置
```shell
cat > /usr/local/kubernetes/kube-apiserver.service <<'EOF'
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=etcd.service
Wants=etcd.service
[Service]
EnvironmentFile=-/etc/kubernetes/kube-apiserver.conf
ExecStart=/usr/local/bin/kube-apiserver $KUBE_APISERVER_OPTS
Restart=on-failure
RestartSec=5
Type=notify
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
```
控制节点分发
```shell
for i in master{01,02,03}; \
do \
scp ca*.pem kube-apiserver*.pem $i:/etc/kubernetes/ssl/ ;\
scp token.csv $i/kube-apiserver.conf $i:/etc/kubernetes/ ;\
scp kube-apiserver.service $i:/etc/systemd/system/kube-apiserver.service; \
done
```
## 部署 API-SERVER
> 在控制节点上操作
```shell
systemctl daemon-reload
systemctl enable kube-apiserver
systemctl restart kube-apiserver
systemctl status kube-apiserver
```
测试
```shell
curl --insecure https://192.168.127.13:6443/
curl --insecure https://192.168.127.14:6443/
curl --insecure https://192.168.127.15:6443/
curl --insecure https://192.168.127.10:6443/
```
> 报 401 是正常的
## 配置 KUBECTL
> 在 bastion 上操作
KUBECTL 证书配置
```shell
cd /usr/local/kubernetes
cat > admin-csr.json << "EOF"
{
"CN": "admin",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:masters",
"OU": "system"
}
]
}
EOF
```
KUBECTL 证书
```shell
cfssl gencert \
-ca=ca.pem \
-ca-key=ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
admin-csr.json | \
cfssljson \
-bare \
admin
```
KUBECTL 配置文件
```shell
kubectl config set-cluster kubernetes \
--certificate-authority=ca.pem \
--embed-certs=true \
--server=https://192.168.127.10:6443 \
--kubeconfig=kube.config
kubectl config set-credentials admin \
--client-certificate=admin.pem \
--client-key=admin-key.pem \
--embed-certs=true \
--kubeconfig=kube.config
kubectl config set-context kubernetes \
--cluster=kubernetes \
--user=admin \
--kubeconfig=kube.config
kubectl config use-context kubernetes \
--kubeconfig=kube.config
```
控制节点分发
```shell
for i in master{01,02,03}; \
do \
scp admin*.pem $i:/etc/kubernetes/ssl/ ;\
scp kube.config $i:/root/.kube/config ;\
done
```
## 部署 KUBECTL
> 在 控制节点 上操作
修改环境变量
```shell
cat >> $HOME/.bash_profile <<'EOF'
export KUBECONFIG=$HOME/.kube/config
EOF
source $HOME/.bash_profile
```
集群角色绑定
```shell
kubectl create clusterrolebinding kube-apiserver:kubelet-apis \
--clusterrole=system:kubelet-api-admin \
--user kubernetes \
--kubeconfig=/root/.kube/config
```
> 只有一个会成功 其他两个已存在
查看集群信息
```shell
kubectl cluster-info
```
查看组件状态
```shell
kubectl get componentstatuses
```
查看资源对象
```shell
kubectl get all --all-namespaces
```
命令补全
```shell
yum install -y bash-completion
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
kubectl completion bash > ~/.kube/completion.bash.inc
source '/root/.kube/completion.bash.inc'
source $HOME/.bash_profile
```
## 配置 KUBE-CONTROLLER-MANAGER
> 在 bastion 节点操作
KUBE-CONTROLLER-MANAGER 证书配置
```shell
cd /usr/local/kubernetes
cat > kube-controller-manager-csr.json << "EOF"
{
"CN": "system:kube-controller-manager",
"key": {
"algo": "rsa",
"size": 2048
},
"hosts": [
"127.0.0.1",
"192.168.127.13",
"192.168.127.14",
"192.168.127.15"
],
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-controller-manager",
"OU": "system"
}
]
}
EOF
```
KUBE-CONTROLLER-MANAGER 证书
```shell
cfssl gencert \
-ca=ca.pem -ca-key=ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
kube-controller-manager-csr.json | \
cfssljson \
-bare \
kube-controller-manager
```
KUBE-CONTROLLER-MANAGER 配置
```shell
kubectl config set-cluster kubernetes \
--certificate-authority=ca.pem \
--embed-certs=true \
--server=https://192.168.127.10:6443 \
--kubeconfig=kube-controller-manager.kubeconfig
kubectl config set-credentials system:kube-controller-manager \
--client-certificate=kube-controller-manager.pem \
--client-key=kube-controller-manager-key.pem \
--embed-certs=true \
--kubeconfig=kube-controller-manager.kubeconfig
kubectl config set-context system:kube-controller-manager \
--cluster=kubernetes \
--user=system:kube-controller-manager \
--kubeconfig=kube-controller-manager.kubeconfig
kubectl config use-context system:kube-controller-manager \
--kubeconfig=kube-controller-manager.kubeconfig
```
```shell
cat > kube-controller-manager.conf << "EOF"
KUBE_CONTROLLER_MANAGER_OPTS="\
--secure-port=10257 \
--bind-address=127.0.0.1 \
--kubeconfig=/etc/kubernetes/kube-controller-manager.kubeconfig \
--service-cluster-ip-range=10.96.0.0/16 \
--cluster-name=kubernetes \
--cluster-signing-cert-file=/etc/kubernetes/ssl/ca.pem \
--cluster-signing-key-file=/etc/kubernetes/ssl/ca-key.pem \
--allocate-node-cidrs=true \
--cluster-cidr=10.244.0.0/16 \
--experimental-cluster-signing-duration=87600h \
--root-ca-file=/etc/kubernetes/ssl/ca.pem \
--service-account-private-key-file=/etc/kubernetes/ssl/ca-key.pem \
--leader-elect=true \
--feature-gates=RotateKubeletServerCertificate=true \
--controllers=*,bootstrapsigner,tokencleaner \
--horizontal-pod-autoscaler-sync-period=10s \
--tls-cert-file=/etc/kubernetes/ssl/kube-controller-manager.pem \
--tls-private-key-file=/etc/kubernetes/ssl/kube-controller-manager-key.pem \
--use-service-account-credentials=true \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/var/log/kubernetes \
--v=4"
EOF
```
KUBE-CONTROLLER-MANAGER 服务配置
```shell
cat > kube-controller-manager.service << "EOF"
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/etc/kubernetes/kube-controller-manager.conf
ExecStart=/usr/local/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
```
控制节点分发
```shell
for i in master{01,02,03}; \
do \
scp kube-controller-manager*.pem $i:/etc/kubernetes/ssl/; \
scp kube-controller-manager.service $i:/usr/lib/systemd/system/; \
scp kube-controller-manager.kubeconfig kube-controller-manager.conf $i:/etc/kubernetes/; \
done
```
## 部署 KUBE-CONTROLLER-MANAGER
> 在 控制节点 上操作
启动服务
```shell
systemctl daemon-reload
systemctl enable kube-controller-manager
systemctl restart kube-controller-manager
systemctl status kube-controller-manager
```
查看组件状态
```shell
kubectl get componentstatuses
```
## 配置 KUBE-SCHEDULER
KUBE-SCHEDULER 证书配置
```shell
cd /usr/local/kubernetes
cat > kube-scheduler-csr.json << "EOF"
{
"CN": "system:kube-scheduler",
"hosts": [
"127.0.0.1",
"192.168.127.13",
"192.168.127.14",
"192.168.127.15"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-scheduler",
"OU": "system"
}
]
}
EOF
```
KUBE-SCHEDULER 证书
```shell
cfssl gencert \
-ca=ca.pem \
-ca-key=ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
kube-scheduler-csr.json | \
cfssljson \
-bare \
kube-scheduler
```
KUBE-SCHEDULER 配置
```shell
cat > kube-scheduler.conf << "EOF"
KUBE_SCHEDULER_OPTS="--bind-address=127.0.0.1 \
--kubeconfig=/etc/kubernetes/kube-scheduler.kubeconfig \
--leader-elect=true \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/var/log/kubernetes \
--v=4"
EOF
```
```shell
kubectl config set-cluster kubernetes \
--certificate-authority=ca.pem \
--embed-certs=true \
--server=https://192.168.127.10:6443 \
--kubeconfig=kube-scheduler.kubeconfig
kubectl config set-credentials system:kube-scheduler \
--client-certificate=kube-scheduler.pem \
--client-key=kube-scheduler-key.pem \
--embed-certs=true \
--kubeconfig=kube-scheduler.kubeconfig
kubectl config set-context system:kube-scheduler \
--cluster=kubernetes \
--user=system:kube-scheduler \
--kubeconfig=kube-scheduler.kubeconfig
kubectl config use-context system:kube-scheduler \
--kubeconfig=kube-scheduler.kubeconfig
```
KUBE-SCHEDULER 服务配置
```shell
cat > kube-scheduler.service << "EOF"
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/etc/kubernetes/kube-scheduler.conf
ExecStart=/usr/local/bin/kube-scheduler $KUBE_SCHEDULER_OPTS
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
```
控制节点分发
```shell
for i in master{01,02,03}; \
do \
scp kube-scheduler*.pem $i:/etc/kubernetes/ssl/; \
scp kube-scheduler.service $i:/usr/lib/systemd/system/; \
scp kube-scheduler.kubeconfig kube-scheduler.conf $i:/etc/kubernetes/; \
done
```
## 启动 KUBE-SCHEDULER
> 在 控制节点 上操作
启动服务
```shell
systemctl daemon-reload
systemctl enable kube-scheduler
systemctl restart kube-scheduler
systemctl status kube-scheduler
```
查看组件状态
```shell
kubectl get componentstatuses
```
## 配置 CONTAINERD
> 在 工作节点 上操作
创建路径
```shell
mkdir -p /etc/containerd/
```
下载
```shell
wget https://github.com/containerd/containerd/releases/download/v1.7.5/cri-containerd-cni-1.7.5-linux-amd64.tar.gz
```
解压
```shell
tar -xf cri-containerd-cni-1.7.5-linux-amd64.tar.gz -C /
```
配置
```shell
cat >/etc/containerd/config.toml<<EOF
root = "/var/lib/containerd"
state = "/run/containerd"
oom_score = -999
[grpc]
address = "/run/containerd/containerd.sock"
uid = 0
gid = 0
max_recv_message_size = 16777216
max_send_message_size = 16777216
[debug]
address = ""
uid = 0
gid = 0
level = ""
[metrics]
address = ""
grpc_histogram = false
[cgroup]
path = ""
[plugins]
[plugins.cgroups]
no_prometheus = false
[plugins.cri]
stream_server_address = "127.0.0.1"
stream_server_port = "0"
enable_selinux = false
sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.6"
stats_collect_period = 10
systemd_cgroup = true
enable_tls_streaming = false
max_container_log_line_size = 16384
[plugins.cri.containerd]
snapshotter = "overlayfs"
no_pivot = false
[plugins.cri.containerd.default_runtime]
runtime_type = "io.containerd.runtime.v1.linux"
runtime_engine = ""
runtime_root = ""
[plugins.cri.containerd.untrusted_workload_runtime]
runtime_type = ""
runtime_engine = ""
runtime_root = ""
[plugins.cri.cni]
bin_dir = "/opt/cni/bin"
conf_dir = "/etc/cni/net.d"
conf_template = "/etc/cni/net.d/10-default.conf"
[plugins.cri.registry]
[plugins.cri.registry.mirrors]
[plugins.cri.registry.mirrors."docker.io"]
endpoint = [
"https://68k4zzfk.mirror.aliyuncs.com",
"https://docker.mirrors.ustc.edu.cn",
"https://hub-mirror.c.163.com"
]
[plugins.cri.registry.mirrors."gcr.io"]
endpoint = [
"https://registry.aliyuncs.com"
]
[plugins.cri.registry.mirrors."k8s.gcr.io"]
endpoint = [
"https://registry.aliyuncs.com/google_containers"
]
[plugins.cri.x509_key_pair_streaming]
tls_cert_file = ""
tls_key_file = ""
[plugins.diff-service]
default = ["walking"]
[plugins.linux]
shim = "containerd-shim"
runtime = "runc"
runtime_root = ""
no_shim = false
shim_debug = false
[plugins.opt]
path = "/opt/containerd"
[plugins.restart]
interval = "10s"
[plugins.scheduler]
pause_threshold = 0.02
deletion_threshold = 0
mutation_threshold = 100
schedule_delay = "0s"
startup_delay = "100ms"
EOF
```
runc
下载
```shell
wget https://github.com/opencontainers/runc/releases/download/v1.1.9/runc.amd64
```
安装
```shell
chmod +x runc.amd64
mv runc.amd64 /usr/local/sbin/runc
```
查看
```shell
runc -v
```
## 启动 CONTAINERD
启动服务
```shell
systemctl daemon-reload
systemctl enable containerd
systemctl restart containerd
systemctl status containerd
```
## 配置 KUBERLET
> 在 bastion 上操作
KUBERLET 模板
```shell
cat > kubelet.json.tmpl << "EOF"
{
"kind": "KubeletConfiguration",
"apiVersion": "kubelet.config.k8s.io/v1beta1",
"authentication": {
"x509": {
"clientCAFile": "/etc/kubernetes/ssl/ca.pem"
},
"webhook": {
"enabled": true,
"cacheTTL": "2m0s"
},
"anonymous": {
"enabled": false
}
},
"authorization": {
"mode": "Webhook",
"webhook": {
"cacheAuthorizedTTL": "5m0s",
"cacheUnauthorizedTTL": "30s"
}
},
"address": "$HOSTNAME",
"port": 10250,
"readOnlyPort": 10255,
"cgroupDriver": "systemd",
"hairpinMode": "promiscuous-bridge",
"serializeImagePulls": false,
"clusterDomain": "cluster.local.",
"clusterDNS": ["10.96.0.2"]
}
EOF
```
KUBERLET 配置
```shell
sed -e "s|\$HOSTNAME|192.168.127.21|g" \
kubelet.json.tmpl > worker01/kubelet.json
sed -e "s|\$HOSTNAME|192.168.127.22|g" \
kubelet.json.tmpl > worker02/kubelet.json
sed -e "s|\$HOSTNAME|192.168.127.23|g" \
kubelet.json.tmpl > worker03/kubelet.json
```
```shell
BOOTSTRAP_TOKEN=$(awk -F "," '{print $1}' token.csv)
echo $BOOTSTRAP_TOKEN
kubectl config set-cluster kubernetes \
--certificate-authority=ca.pem \
--embed-certs=true \
--server=https://192.168.127.10:6443 \
--kubeconfig=kubelet-bootstrap.kubeconfig
kubectl config set-credentials kubelet-bootstrap \
--token=${BOOTSTRAP_TOKEN} \
--kubeconfig=kubelet-bootstrap.kubeconfig
kubectl config set-context default \
--cluster=kubernetes \
--user=kubelet-bootstrap \
--kubeconfig=kubelet-bootstrap.kubeconfig
kubectl config use-context default \
--kubeconfig=kubelet-bootstrap.kubeconfig
kubectl create clusterrolebinding cluster-system-anonymous \
--clusterrole=cluster-admin \
--user=kubelet-bootstrap \
--kubeconfig=kube.config
kubectl create clusterrolebinding kubelet-bootstrap \
--clusterrole=system:node-bootstrapper \
--user=kubelet-bootstrap \
--kubeconfig=kubelet-bootstrap.kubeconfig
```
KUBERLET 服务配置
```shell
cat > kubelet.service << "EOF"
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=containerd.service
Requires=containerd.service
[Service]
WorkingDirectory=/var/lib/kubelet
ExecStart=/usr/local/bin/kubelet \
--bootstrap-kubeconfig=/etc/kubernetes/kubelet-bootstrap.kubeconfig \
--cert-dir=/etc/kubernetes/ssl \
--kubeconfig=/etc/kubernetes/kubelet.kubeconfig \
--config=/etc/kubernetes/kubelet.json \
--container-runtime=remote \
--container-runtime-endpoint=unix:///run/containerd/containerd.sock \
--rotate-certificates \
--pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.2 \
--root-dir=/etc/cni/net.d \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/var/log/kubernetes \
--v=4
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
```
同步到工作节点
```shell
for i in worker{01,02,03}; \
do \
scp ca.pem $i:/etc/kubernetes/ssl/; \
scp $i/kubelet.json $i:/etc/kubernetes/; \
scp kubelet.service $i:/usr/lib/systemd/system/; \
scp kubelet-bootstrap.kubeconfig $i:/etc/kubernetes/; \
done
```
## 启动 KUBERLET
> 所有工作节点
创建目录及启动服务
```shell
mkdir -p /var/lib/kubelet
```
```shell
systemctl daemon-reload
systemctl enable kubelet
systemctl restart kubelet
systemctl status kubelet
```
> 所有控制节点
```shell
kubectl describe clusterrolebinding cluster-system-anonymous
kubectl describe clusterrolebinding kubelet-bootstrap
```
```shell
kubectl get nodes
```
```shell
kubectl get csr
```
## 配置 KUBE-PROXY
> 在 bastion 上操作
```shell
cd /usr/local/kubernetes
```
KUBE-PROXY 证书配置
```shell
cat > kube-proxy-csr.json << "EOF"
{
"CN": "system:kube-proxy",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "kubemsb",
"OU": "CN"
}
]
}
EOF
```
KUBE-PROXY 证书
```shell
cfssl gencert \
-ca=ca.pem \
-ca-key=ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
kube-proxy-csr.json | \
cfssljson \
-bare \
kube-proxy
```
KUBE-PROXY 服务配置
```shell
cat > kube-proxy.service << "EOF"
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
WorkingDirectory=/var/lib/kube-proxy
ExecStart=/usr/local/bin/kube-proxy \
--config=/etc/kubernetes/kube-proxy.yaml \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/var/log/kubernetes \
--v=4
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
```
KUBE-PROXY 模板
```shell
cat > kube-proxy.yaml.tmpl << "EOF"
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: $HOSTNAME
clientConnection:
kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
clusterCIDR: 10.244.0.0/16
healthzBindAddress: $HOSTNAME:10256
kind: KubeProxyConfiguration
metricsBindAddress: $HOSTNAME:10249
mode: "ipvs"
EOF
```
KUBE-PROXY 配置
```shell
sed -e "s|\$HOSTNAME|192.168.127.21|g" \
kube-proxy.yaml.tmpl > worker01/kube-proxy.yaml
sed -e "s|\$HOSTNAME|192.168.127.22|g" \
kube-proxy.yaml.tmpl > worker02/kube-proxy.yaml
sed -e "s|\$HOSTNAME|192.168.127.23|g" \
kube-proxy.yaml.tmpl > worker03/kube-proxy.yaml
```
```shell
kubectl config set-cluster kubernetes \
--certificate-authority=ca.pem \
--embed-certs=true \
--server=https://192.168.127.10:6443 \
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-credentials kube-proxy \
--client-certificate=kube-proxy.pem \
--client-key=kube-proxy-key.pem \
--embed-certs=true \
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-context default \
--cluster=kubernetes \
--user=kube-proxy \
--kubeconfig=kube-proxy.kubeconfig
kubectl config use-context default \
--kubeconfig=kube-proxy.kubeconfig
```
同步到工作节点
```shell
for i in worker{01,02,03}; \
do \
scp $i/kube-proxy.yaml $i:/etc/kubernetes/; \
scp kube-proxy.service $i:/usr/lib/systemd/system/; \
scp kube-proxy.kubeconfig $i:/etc/kubernetes/; \
done
```
## 启动 KUBE-PROXY
服务启动
```shell
mkdir -p /var/lib/kube-proxy
```
```shell
systemctl daemon-reload
systemctl enable kube-proxy
systemctl restart kube-proxy
systemctl status kube-proxy
```
## Calico 插件
> 在随便一台控制节点上操作
下载
```shell
wget https://docs.projectcalico.org/v3.19/manifests/calico.yaml
```
修改
```shell
vi calico.yaml
```
```
3683 gg
- name: CALICO_IPV4POOL_CIDR
value: "10.244.0.0/16"
```
应用文件
```shell
kubectl apply -f calico.yaml
```
验证应用结果
```shell
kubectl get pods -A
```
```shell
kubectl get nodes
```
## CoreDNS 安装
```shell
cat > coredns.yaml << "EOF"
apiVersion: v1
kind: ServiceAccount
metadata:
name: coredns
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:coredns
rules:
- apiGroups:
- ""
resources:
- endpoints
- services
- pods
- namespaces
verbs:
- list
- watch
- apiGroups:
- discovery.k8s.io
resources:
- endpointslices
verbs:
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:coredns
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:coredns
subjects:
- kind: ServiceAccount
name: coredns
namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
data:
Corefile: |
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/name: "CoreDNS"
spec:
# replicas: not specified here:
# 1. Default is 1.
# 2. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
spec:
priorityClassName: system-cluster-critical
serviceAccountName: coredns
tolerations:
- key: "CriticalAddonsOnly"
operator: "Exists"
nodeSelector:
kubernetes.io/os: linux
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 100
podAffinityTerm:
labelSelector:
matchExpressions:
- key: k8s-app
operator: In
values: ["kube-dns"]
topologyKey: kubernetes.io/hostname
containers:
- name: coredns
image: coredns/coredns:1.8.4
imagePullPolicy: IfNotPresent
resources:
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
readOnly: true
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9153
name: metrics
protocol: TCP
securityContext:
allowPrivilegeEscalation: false
capabilities:
add:
- NET_BIND_SERVICE
drop:
- all
readOnlyRootFilesystem: true
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /ready
port: 8181
scheme: HTTP
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile
---
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
annotations:
prometheus.io/port: "9153"
prometheus.io/scrape: "true"
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
kubernetes.io/name: "CoreDNS"
spec:
selector:
k8s-app: kube-dns
clusterIP: 10.96.0.2
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
- name: metrics
port: 9153
protocol: TCP
EOF
```
```shell
kubectl apply -f coredns.yaml
```
```shell
kubectl get endpoints
kubectl get nodes
kubectl get pods -A
kubectl get cs
kubectl get --raw='/readyz?verbose'
```
部署应用验证
```shell
cat > nginx.yaml << "EOF"
---
apiVersion: v1
kind: ReplicationController
metadata:
name: nginx-web
spec:
replicas: 2
selector:
name: nginx
template:
metadata:
labels:
name: nginx
spec:
containers:
- name: nginx
image: nginx:1.19.6
ports:
- containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
name: nginx-service-nodeport
spec:
ports:
- port: 80
targetPort: 80
nodePort: 30001
protocol: TCP
type: NodePort
selector:
name: nginx
EOF
```
```shell
kubectl apply -f nginx.yaml
```
```shell
kubectl get pods -o wide
curl 192.168.127.21:30001
curl 192.168.127.22:30001
curl 192.168.127.23:30001
```