K8S一：部署etcd集群

1、安装docker

# yum install -y yum-utils device-mapper-persistent-data lvm2 
# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
# yum install docker-ce
更改镜像源
# cat << EOF > /etc/docker/daemon.json
{
	"registry-mirrors": [ "https://registry.docker-cn.com"], 
	"insecure-registries":["192.168.0.210:5000"]
}
# systemctl start docker 
# systemctl enable docker

2、安装证书生成工具cfssl、生成证书，执行certificate.sh生成证书

# wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
# wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
# wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
# chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64 
# mv cfssl_linux-amd64 /usr/local/bin/cfssl
# mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
# mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo

certificate.sh
# 为方面学习中遇到问题交流，请加Docker技术学员群：397834690  （加群说明你购买时的用户名称，谢谢）
cat > ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF

cat > ca-csr.json <<EOF
{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing",
      	    "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

#-----------------------

cat > server-csr.json <<EOF
{
    "CN": "kubernetes",
    "hosts": [
      "127.0.0.1",
      "192.168.1.20",
      "192.168.1.22",
      "192.168.1.23",
      "10.10.10.1",
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server

#-----------------------

cat > admin-csr.json <<EOF
{
  "CN": "admin",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "system:masters",
      "OU": "System"
    }
  ]
}
EOF

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin

#-----------------------

cat > kube-proxy-csr.json <<EOF
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy

3、把etcd安装到/opt/kubernetes这个目录，创建目录

# mkdir -p /opt/kubernetes/{bin,cfg,ssl}

4、etcd二进制文件移动到/opt/kubernetes/bin

# mv ~/etcd-v3.2.12-linux-amd64/etcd* /opt/kubernetes/bin

5、编写配置文件

# vim /opt/kubernetes/bin/cfg/etcd
#[Member]
ETCD_NAME="etcd01"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.1.20:2380"    #本机IP
ETCD_LISTEN_CLIENT_URLS="https://192.168.1.20:2379"  #本机IP

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.20:2380"   #本机IP
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.1.20:2379"         #本机IP
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.1.20:2380,etcd02=https://192.168.1.22:2380,etcd03=https://192.168.1.23:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"

6、复制证书文件到ssl目录

mv ~/ssl/server*pem /opt/kubernetes/ssl/
mv ~/ssl/ca*pem /opt/kubernetes/ssl/

7、etcd加入systemctl管理工具

# vim /usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=-/opt/kubernetes/cfg/etcd
ExecStart=/opt/kubernetes/bin/etcd \
--name=${ETCD_NAME} \
--data-dir=${ETCD_DATA_DIR} \
--listen-peer-urls=${ETCD_LISTEN_PEER_URLS} \
--listen-client-urls=${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379 \
--advertise-client-urls=${ETCD_ADVERTISE_CLIENT_URLS} \
--initial-advertise-peer-urls=${ETCD_INITIAL_ADVERTISE_PEER_URLS} \
--initial-cluster=${ETCD_INITIAL_CLUSTER} \
--initial-cluster-token=${ETCD_INITIAL_CLUSTER} \
--initial-cluster-state=new \
--cert-file=/opt/kubernetes/ssl/server.pem \
--key-file=/opt/kubernetes/ssl/server-key.pem \
--peer-cert-file=/opt/kubernetes/ssl/server.pem \
--peer-key-file=/opt/kubernetes/ssl/server-key.pem \
--trusted-ca-file=/opt/kubernetes/ssl/ca.pem \
--peer-trusted-ca-file=/opt/kubernetes/ssl/ca.pem
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

8、启动etcd

# systemctl start etcd
# systemctl enable etcd

9、配置node节点，只需要改动，以下文件就可以了

# vim /opt/kubernetes/bin/cfg/etcd
#[Member]
ETCD_NAME="etcd02"             #node改动
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.1.22:2380"    #node改动
ETCD_LISTEN_CLIENT_URLS="https://192.168.1.22:2379"   #node改动

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.22:2380"   #node改动
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.1.22:2379"          #node改动
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.1.20:2380,etcd02=https://192.168.1.22:2380,etcd03=https://192.168.1.23:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"

10、查看集群状态：cd到/opt/kubernetes/ssl目录，执行以下语句

# /opt/kubernetes/bin/etcdctl \
--ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem \
--endpoints="https://192.168.1.20:2379,https://192.168.1.22:2379,https://192.168.1.23:2379" cluster-health
member 2cec3559c840a575 is healthy: got healthy result from https://192.168.1.23:2379
member 4276776ed46b3a34 is healthy: got healthy result from https://192.168.1.22:2379
member 5b439a22b5a51b6f is healthy: got healthy result from https://192.168.1.20:2379
cluster is healthy

K8S一：部署etcd集群

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