1.准备etcd软件包
etcd官网下载：https://github.com/coreos/etcd-operator
wget https://github.com/coreos/etcd/releases/download/v3.2.18/etcd-v3.2.18-linux-amd64.tar.gz
[root@linux-node1 src]# tar zxf etcd-v3.2.18-linux-amd64.tar.gz
[root@linux-node1 src]# cd etcd-v3.2.18-linux-amd64
[root@linux-node1 etcd-v3.2.18-linux-amd64]# cp etcd etcdctl /opt/kubernetes/bin/
[root@linux-node1 etcd-v3.2.18-linux-amd64]# scp etcd etcdctl 192.168.56.12:/opt/kubernetes/bin/
[root@linux-node1 etcd-v3.2.18-linux-amd64]# scp etcd etcdctl 192.168.56.13:/opt/kubernetes/bin/
2.创建 etcd 证书签名请求：
[root@linux-node1 ~]# cat > etcd-csr.json <<EOF
{
"CN": "etcd",
"hosts": [
"127.0.0.1",
"192.168.56.11",
"192.168.56.12",
"192.168.56.13"
],
"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：
[root@linux-node1 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
[root@linux-node1 ssl]# ls -l etcd*
-rw-r--r-- 1 root root 1062 Sep 23 20:11 etcd.csr
-rw-r--r-- 1 root root 287 Sep 23 20:10 etcd-csr.json
-rw------- 1 root root 1675 Sep 23 20:11 etcd-key.pem
-rw-r--r-- 1 root root 1436 Sep 23 20:11 etcd.pem
4.将证书移动到/opt/kubernetes/ssl目录下
[root@linux-node1 ssl]# cp etcd*.pem /opt/kubernetes/ssl
[root@linux-node1 ssl]# scp etcd*.pem 192.168.56.12:/opt/kubernetes/ssl
[root@linux-node1 ssl]# scp etcd*.pem 192.168.56.13:/opt/kubernetes/ssl
[root@linux-node1 ssl]# rm -f etcd.csr etcd-csr.json
5.设置ETCD配置文件
[root@linux-node1 ~]# cat > /opt/kubernetes/cfg/etcd.conf <<EOF
#[member]
ETCD_NAME="etcd-node1" #每个节点要唯一
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://192.168.56.11:2380" #节点IP地址
ETCD_LISTEN_CLIENT_URLS="https://192.168.56.11:2379,https://127.0.0.1:2379" #节点IP地址
#ETCD_MAX_SNAPSHOTS="5"
#ETCD_MAX_WALS="5"
#ETCD_CORS=""
#[cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.56.11:2380" #节点IP地址
# if you use different ETCD_NAME (e.g. test),
# set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."
ETCD_INITIAL_CLUSTER="etcd-node1=https://192.168.56.11:2380,etcd-node2=https://192.168.56.12:2380,etcd-node3=https://192.168.56.13:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="k8s-etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.56.11:2379" #节点IP地址
#[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
#三台都要创建，注意修改对应IP地址
6.创建ETCD系统服务
[root@linux-node1 ~]# 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.重新加载系统服务
# scp /opt/kubernetes/cfg/etcd.conf 192.168.56.12:/opt/kubernetes/cfg/
# scp /etc/systemd/system/etcd.service 192.168.56.12:/etc/systemd/system/
# scp /opt/kubernetes/cfg/etcd.conf 192.168.56.13:/opt/kubernetes/cfg/
# scp /etc/systemd/system/etcd.service 192.168.56.13:/etc/systemd/system/
在所有节点上创建etcd存储目录并启动etcd
[root@linux-node1 ~]# mkdir /var/lib/etcd
[root@linux-node1 ~]# systemctl daemon-reload && systemctl enable etcd && systemctl start etcd && systemctl status etcd
请注意时间要同步，否则集群启动会报如下错：
Sep 23 12:06:15 linux-node3 etcd: rejected connection from "192.168.56.12:58420" (error "tls: failed to verify client's certificate: x509: certificate has expired or is not yet valid", ServerName "")
8.验证集群
[root@linux-node1 ssl]# etcdctl --endpoints=https://192.168.56.11:2379 \
--ca-file=/opt/kubernetes/ssl/ca.pem \
--cert-file=/opt/kubernetes/ssl/etcd.pem \
--key-file=/opt/kubernetes/ssl/etcd-key.pem cluster-health
member 435fb0a8da627a4c is healthy: got healthy result from https://192.168.56.12:2379
member 6566e06d7343e1bb is healthy: got healthy result from https://192.168.56.11:2379
member ce7b884e428b6c8c is healthy: got healthy result from https://192.168.56.13:2379
cluster is healthy
