Kubernetes集群部署之三ETCD集群部署详解架构师

1.准备etcd软件包并分发etcd文件:

[[email protected] ~]# cd /usr/local/src 
[[email protected]-master src]#wget https://github.com/coreos/etcd/releases/download/v3.2.18/etcd-v3.2.18-linux-amd64.tar.gz 
[[email protected] src]# tar zxf etcd-v3.2.18-linux-amd64.tar.gz 
[[email protected]-master src]# cd etcd-v3.2.18-linux-amd64 
[[email protected]-master etcd-v3.2.18-linux-amd64]# cp etcd etcdctl /opt/kubernetes/bin/  
[[email protected]-master etcd-v3.2.18-linux-amd64]# scp etcd etcdctl 10.200.3.106:/opt/kubernetes/bin/ 
[[email protected]-master etcd-v3.2.18-linux-amd64]# scp etcd etcdctl 10.200.3.107:/opt/kubernetes/bin/

2.创建 etcd 证书签名请求：

[[email protected] ~]# cd /usr/local/src/ssl
[[email protected]-master ssl]# cat > etcd-csr.json <<EOF 
{ 
  "CN": "etcd", 
  "hosts": [ 
  "127.0.0.1", 
  "10.200.3.105", 
  "10.200.3.106", 
  "10.200.3.107" 
  ], 
  "key": { 
    "algo": "rsa", 
    "size": 2048 
  }, 
  "names": [ 
    { 
      "C": "CN", 
      "ST": "BeiJing", 
      "L": "BeiJing", 
      "O": "k8s", 
      "OU": "System" 
    } 
  ] 
} 
EOF

3.生成 etcd 证书和私钥：

[[email protected] ssl]# cfssl gencert -ca=/opt/kubernetes/ssl/ca.pem / 
  -ca-key=/opt/kubernetes/ssl/ca-key.pem / 
  -config=/opt/kubernetes/ssl/ca-config.json / 
  -profile=kubernetes etcd-csr.json | cfssljson -bare etcd 
会生成以下证书文件 
[[email protected]-master ssl]# ls -l etcd* 
-rw-r--r-- 1 root root 1045 Mar  5 11:27 etcd.csr 
-rw-r--r-- 1 root root  257 Mar  5 11:25 etcd-csr.json 
-rw------- 1 root root 1679 Mar  5 11:27 etcd-key.pem 
-rw-r--r-- 1 root root 1419 Mar  5 11:27 etcd.pem

4.将证书移动到/opt/kubernetes/ssl目录下:

[[email protected] ssl]# cp etcd*.pem /opt/kubernetes/ssl 
[[email protected]-master ssl]# scp etcd*.pem 10.200.3.106:/opt/kubernetes/ssl 
[[email protected]-master ssl]# scp etcd*.pem 10.200.3.107:/opt/kubernetes/ssl 
[[email protected]-master ssl]# rm -f etcd.csr etcd-csr.json

5.设置ETCD 配置文件

[email protected] ssl]#cat > /opt/kubernetes/cfg/etcd.conf <<EOF 
#[member] 
ETCD_NAME="k8s-master" 
ETCD_DATA_DIR="/var/lib/etcd/default.etcd" 
#ETCD_SNAPSHOT_COUNTER="10000" 
#ETCD_HEARTBEAT_INTERVAL="100" 
#ETCD_ELECTION_TIMEOUT="1000" 
ETCD_LISTEN_PEER_URLS="https://10.200.3.105:2380" 
ETCD_LISTEN_CLIENT_URLS="https://10.200.3.105:2379,https://127.0.0.1:2379" 
#ETCD_MAX_SNAPSHOTS="5" 
#ETCD_MAX_WALS="5" 
#ETCD_CORS="" 
#[cluster] 
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://10.200.3.105:2380" 
# if you use different ETCD_NAME (e.g. test), 
# set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..." 
ETCD_INITIAL_CLUSTER="k8s-master=https://10.200.3.105:2380,k8s-node-1=https://10.200.3.106:2380,k8s-node-2=https://10.200.3.107:2380" 
ETCD_INITIAL_CLUSTER_STATE="new" 
ETCD_INITIAL_CLUSTER_TOKEN="k8s-etcd-cluster" 
ETCD_ADVERTISE_CLIENT_URLS="https://10.200.3.105:2379" 
#[security] 
CLIENT_CERT_AUTH="true" 
ETCD_CA_FILE="/opt/kubernetes/ssl/ca.pem" 
ETCD_CERT_FILE="/opt/kubernetes/ssl/etcd.pem" 
ETCD_KEY_FILE="/opt/kubernetes/ssl/etcd-key.pem" 
PEER_CLIENT_CERT_AUTH="true" 
ETCD_PEER_CA_FILE="/opt/kubernetes/ssl/ca.pem" 
ETCD_PEER_CERT_FILE="/opt/kubernetes/ssl/etcd.pem" 
ETCD_PEER_KEY_FILE="/opt/kubernetes/ssl/etcd-key.pem" 
 
EOF

6.创建ETCD系统服务

[[email protected] ssl]# cat > /etc/systemd/system/etcd.service <<EOF 
[Unit] 
Description=Etcd Server 
After=network.target 
 
[Service] 
Type=simple 
WorkingDirectory=/var/lib/etcd 
EnvironmentFile=-/opt/kubernetes/cfg/etcd.conf 
# set GOMAXPROCS to number of processors 
ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /opt/kubernetes/bin/etcd" 
Type=notify 
 
[Install] 
WantedBy=multi-user.target 
 
EOF

7.文件分发到两个node节点中:

[[email protected] ~]# scp /opt/kubernetes/cfg/etcd.conf 10.200.3.106:/opt/kubernetes/cfg/ 
[[email protected]-master ~]# scp /etc/systemd/system/etcd.service 10.200.3.106:/etc/systemd/system/ 
[[email protected]-master ~]# scp /opt/kubernetes/cfg/etcd.conf 10.200.3.107:/opt/kubernetes/cfg/ 
[[email protected]-master ~]# scp /etc/systemd/system/etcd.service 10.200.3.107:/etc/systemd/system/

8.修改node节点etcd.conf文件,ETCD_NAME改为本机的hostname.ETCD…URLS改为本机的ip地址

在k8s-node-1 修改etcd.conf文件

[root@k8s-node-1 ~]# cat >/opt/kubernetes/cfg/etcd.conf <<EOF 
#[member] 
ETCD_NAME="k8s-node-1" 
ETCD_DATA_DIR="/var/lib/etcd/default.etcd" 
#ETCD_SNAPSHOT_COUNTER="10000" 
#ETCD_HEARTBEAT_INTERVAL="100" 
#ETCD_ELECTION_TIMEOUT="1000" 
ETCD_LISTEN_PEER_URLS="https://10.200.3.106:2380" 
ETCD_LISTEN_CLIENT_URLS="https://10.200.3.106:2379,https://127.0.0.1:2379" 
#ETCD_MAX_SNAPSHOTS="5" 
#ETCD_MAX_WALS="5" 
#ETCD_CORS="" 
#[cluster] 
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://10.200.3.106:2380" 
# if you use different ETCD_NAME (e.g. test), 
# set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..." 
ETCD_INITIAL_CLUSTER="k8s-master=https://10.200.3.105:2380,k8s-node-1=https://10.200.3.106:2380,k8s-node-2=https://10.200.3.107:2380" 
ETCD_INITIAL_CLUSTER_STATE="new" 
ETCD_INITIAL_CLUSTER_TOKEN="k8s-etcd-cluster" 
ETCD_ADVERTISE_CLIENT_URLS="https://10.200.3.106:2379" 
#[security] 
CLIENT_CERT_AUTH="true" 
ETCD_CA_FILE="/opt/kubernetes/ssl/ca.pem" 
ETCD_CERT_FILE="/opt/kubernetes/ssl/etcd.pem" 
ETCD_KEY_FILE="/opt/kubernetes/ssl/etcd-key.pem" 
PEER_CLIENT_CERT_AUTH="true" 
ETCD_PEER_CA_FILE="/opt/kubernetes/ssl/ca.pem" 
ETCD_PEER_CERT_FILE="/opt/kubernetes/ssl/etcd.pem" 
ETCD_PEER_KEY_FILE="/opt/kubernetes/ssl/etcd-key.pem" 
 
EOF

在k8s-node-2节点修改etcd.conf文件

[root@k8s-node-2 ~]# cat >/opt/kubernetes/cfg/etcd.conf  <<EOF 
#[member] 
ETCD_NAME="k8s-node-2" 
ETCD_DATA_DIR="/var/lib/etcd/default.etcd" 
#ETCD_SNAPSHOT_COUNTER="10000" 
#ETCD_HEARTBEAT_INTERVAL="100" 
#ETCD_ELECTION_TIMEOUT="1000" 
ETCD_LISTEN_PEER_URLS="https://10.200.3.107:2380" 
ETCD_LISTEN_CLIENT_URLS="https://10.200.3.107:2379,https://127.0.0.1:2379" 
#ETCD_MAX_SNAPSHOTS="5" 
#ETCD_MAX_WALS="5" 
#ETCD_CORS="" 
#[cluster] 
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://10.200.3.107:2380" 
# if you use different ETCD_NAME (e.g. test), 
# set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..." 
ETCD_INITIAL_CLUSTER="k8s-master=https://10.200.3.105:2380,k8s-node-1=https://10.200.3.106:2380,k8s-node-2=https://10.200.3.107:2380" 
ETCD_INITIAL_CLUSTER_STATE="new" 
ETCD_INITIAL_CLUSTER_TOKEN="k8s-etcd-cluster" 
ETCD_ADVERTISE_CLIENT_URLS="https://10.200.3.107:2379" 
#[security] 
CLIENT_CERT_AUTH="true" 
ETCD_CA_FILE="/opt/kubernetes/ssl/ca.pem" 
ETCD_CERT_FILE="/opt/kubernetes/ssl/etcd.pem" 
ETCD_KEY_FILE="/opt/kubernetes/ssl/etcd-key.pem" 
PEER_CLIENT_CERT_AUTH="true" 
ETCD_PEER_CA_FILE="/opt/kubernetes/ssl/ca.pem" 
ETCD_PEER_CERT_FILE="/opt/kubernetes/ssl/etcd.pem" 
ETCD_PEER_KEY_FILE="/opt/kubernetes/ssl/etcd-key.pem" 
 
EOF

9.加载并启动系统服务:

[[email protected] ~]# systemctl daemon-reload 
[[email protected]-master ~]# systemctl enable etcd 
[[email protected]-master ~]# systemctl start etcd 
[[email protected]-master ~]# systemctl status etcd

10.验证集群

[[email protected] ~]#etcdctl --endpoints=https://10.200.3.105:2379 / 
  --ca-file=/opt/kubernetes/ssl/ca.pem / 
  --cert-file=/opt/kubernetes/ssl/etcd.pem / 
  --key-file=/opt/kubernetes/ssl/etcd-key.pem cluster-health

输出结果：

member ccbb1e9d1fcf5b1 is healthy: got healthy result from https://10.200.3.105:2379 
member 69e75d4dd1a9a289 is healthy: got healthy result from https://10.200.3.106:2379 
member fe4515ae4c34c4e2 is healthy: got healthy result from https://10.200.3.107:2379 
cluster is healthy

至此etcd集群搭建完成!!!

原创文章，作者：奋斗，如若转载，请注明出处：https://blog.ytso.com/6898.html

Kubernetes集群部署之三ETCD集群部署详解架构师

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