文章目录
1.10、部署kube-proxy
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kube-proxy运行在所有node节点上,它监听apiserver中service和endpoint的变化情况,创建路由规则提供服务IP和负载均衡功能
-
这里使用ipvs模式的kube-proxy进行部署,在各个节点需要安装ipset命令,加载ip_vs内核模块
k8s-02:~ # zypper in ipset
k8s-02:~ # modprobe ip_vs_rr
1.10.0、创建kube-proxy证书
k8s-01:~ # cd /opt/k8s/ssl/
k8s-01:/opt/k8s/ssl # cat > kube-proxy-csr.json <<EOF
{
"CN": "system:kube-proxy",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "ShangHai",
"L": "ShangHai",
"O": "k8s",
"OU": "bandian"
}
]
}
EOF
1.10.1、生成kube-proxy证书和秘钥
k8s-01:/opt/k8s/ssl # cfssl gencert -ca=/opt/k8s/ssl/ca.pem \
-ca-key=/opt/k8s/ssl/ca-key.pem \
-config=/opt/k8s/ssl/ca-config.json \
-profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
1.10.2、创建kube-proxy的kubeconfig文件
k8s-01:/opt/k8s/ssl # source /opt/k8s/bin/k8s-env.sh
"设置集群参数"
k8s-01:/opt/k8s/ssl # kubectl config set-cluster kubernetes \
--certificate-authority=/opt/k8s/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=kube-proxy.kubeconfig
"设置客户端认证参数"
k8s-01:/opt/k8s/ssl # kubectl config set-credentials kube-proxy \
--client-certificate=kube-proxy.pem \
--client-key=kube-proxy-key.pem \
--embed-certs=true \
--kubeconfig=kube-proxy.kubeconfig
"设置上下文参数"
k8s-01:/opt/k8s/ssl # kubectl config set-context default \
--cluster=kubernetes \
--user=kube-proxy \
--kubeconfig=kube-proxy.kubeconfig
"设置默认上下文"
k8s-01:/opt/k8s/ssl # kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
1.10.3、创建kube-proxy配置文件
k8s-01:~ # cd /opt/k8s/conf/
k8s-01:/opt/k8s/conf # source /opt/k8s/bin/k8s-env.sh
k8s-01:/opt/k8s/conf # cat > kube-proxy-config.yaml.template <<EOF
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
clientConnection:
burst: 200
kubeconfig: "/etc/kubernetes/cert/kube-proxy.kubeconfig"
qps: 100
bindAddress: ##NODE_IP##
healthzBindAddress: ##NODE_IP##:10256
metricsBindAddress: ##NODE_IP##:10249
enableProfiling: true
clusterCIDR: ${CLUSTER_CIDR}
mode: "ipvs"
portRange: ""
EOF
clientConnection.kubeconfig
连接 apiserver 的 kubeconfig 文件clusterCIDR
kube-proxy 根据--cluster-cidr
判断集群内部和外部流量,指定--cluster-cidr
或--masquerade-all
选项后 kube-proxy 才会对访问 Service IP 的请求做 SNAT
1.10.4、配置kube-proxy为systemctl启动
k8s-01:~ # cd /opt/k8s/conf/
k8s-01:/opt/k8s/conf # source /opt/k8s/bin/k8s-env.sh
k8s-01:/opt/k8s/conf # cat > kube-proxy.service.template <<EOF
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target
[Service]
WorkingDirectory=${K8S_DIR}/kube-proxy
ExecStart=/opt/k8s/bin/kube-proxy \\
--hostname-override=##NODE_IP## \\
--config=/etc/kubernetes/kube-proxy-config.yaml \\
--logtostderr=true \\
--v=2
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
1.10.5、分发kube-proxy证书和文件到其他节点
#!/usr/bin/env bash
source /opt/k8s/bin/k8s-env.sh
for (( i=0; i < 5; i++ ))
do
sed -e "s/##NODE_IP##/${NODE_IPS[i]}/" /opt/k8s/conf/kube-proxy.service.template > \
/opt/k8s/conf/kube-proxy-${NODE_IPS[i]}.service
sed -e "s/##NODE_NAME##/${NODE_NAMES[i]}/" -e "s/##NODE_IP##/${NODE_IPS[i]}/" \
/opt/k8s/conf/kube-proxy-config.yaml.template > /opt/k8s/conf/kube-proxy-config-${NODE_IPS[i]}.yaml.template
done
for host in ${NODE_IPS[@]}
do
printf "\e[1;34m${host}\e[0m\n"
scp /opt/k8s/ssl/kube-proxy.kubeconfig ${host}:/etc/kubernetes/cert
scp /opt/k8s/conf/kube-proxy-${host}.service ${host}:/etc/systemd/system/kube-proxy.service
scp /opt/k8s/conf/kube-proxy-config-${host}.yaml.template \
${host}:/etc/kubernetes/kube-proxy-config.yaml
scp /opt/k8s/packages/conntrack ${host}:/opt/k8s/bin/
ssh root@${host} "chmod +x /opt/k8s/bin/*"
done
kube-proxy 需要 conntrack
suse 编译比较麻烦
可以找一个 centos 执行 yum -y install conntrack
从 /usr/sbin 目录下获取 conntrack 二进制文件,复制到 suse 内使用(如果有下载了前面提供的百度云的连接,里面已经包含了conntrack 二进制)
1.10.6、启动kube-proxy服务
#!/usr/bin/env bash
source /opt/k8s/bin/k8s-env.sh
for host in ${NODE_IPS[@]}
do
printf "\e[1;34m${host}\e[0m\n"
ssh root@${host} "mkdir -p ${K8S_DIR}/kube-proxy"
ssh root@${host} "modprobe ip_vs_rr"
ssh root@${host} "systemctl daemon-reload && \
systemctl enable kube-proxy --now && \
systemctl status kube-proxy | grep Active"
done
1.10.7、查看kube-proxy端口
k8s-01:~ # ss -nltp | grep kube-proxy
LISTEN 0 128 192.168.72.25:10249 *:* users:(("kube-proxy",pid=103283,fd=12))
LISTEN 0 128 192.168.72.25:10256 *:* users:(("kube-proxy",pid=103283,fd=13))