3.K8S部署-------- 部署ETCD集群

如果没有特别指定在那台服务器执行命令。只需要按照文中的步骤执行即可

0.准备etcd软件包

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/

1.创建 etcd 证书签名请求：

[root@linux-node1 ~]# vim etcd-csr.json
{
"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"
    }
]
}

#ip根据自己情况写。一定要注意

2.生成 etcd 证书和私钥：

[root@linux-node1 ~]# 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@k8s-node1 ~]# 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

3.将证书移动到/opt/kubernetes/ssl目录下

[root@k8s-master ~]# cp etcd*.pem /opt/kubernetes/ssl
[root@linux-node1 ~]# scp etcd*.pem 192.168.56.12:/opt/kubernetes/ssl
[root@linux-node1 ~]# scp etcd*.pem 192.168.56.13:/opt/kubernetes/ssl

4.设置ETCD配置文件

[root@linux-node1 ~]# vim /opt/kubernetes/cfg/etcd.conf

#[member]
ETCD_NAME="etcd-node1"
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"
ETCD_LISTEN_CLIENT_URLS="https://192.168.56.11:2379,https://127.0.0.1:2379"
#ETCD_MAX_SNAPSHOTS="5"
#ETCD_MAX_WALS="5"
#ETCD_CORS=""
#[cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.56.11:2380"
# if you use different ETCD_NAME (e.g. test),
# set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."
ETCD_INITIAL_CLUSTER="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"
#[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"

5.创建ETCD系统服务

[root@linux-node1 ~]# vim /etc/systemd/system/etcd.service

[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

6.重新加载系统服务

[root@linux-node1 ~]# systemctl daemon-reload
[root@linux-node1 ~]# systemctl enable etcd

7.将配置复制到node2，node3上

[root@linux-node1 ~]# scp /opt/kubernetes/cfg/etcd.conf 192.168.56.12:/opt/kubernetes/cfg/
[root@linux-node1 ~]# scp /etc/systemd/system/etcd.service 192.168.56.12:/etc/systemd/system/
[root@linux-node1 ~]# scp /opt/kubernetes/cfg/etcd.conf 192.168.56.13:/opt/kubernetes/cfg/
[root@linux-node1 ~]# scp /etc/systemd/system/etcd.service 192.168.56.13:/etc/systemd/system/

8.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-node2 ~]# mkdir /var/lib/etcd

[root@linux-node3 ~]# mkdir /var/lib/etcd

修改node2 node3的配置

node3修改方法和上面一样不要忘记啦啦啦啦！！！！

9.在所有的 etcd 节点重复下面的启动步骤，直到所有机器的 etcd 服务都已启动。

[root@linux-node1 ~]# systemctl start etcd
[root@linux-node1 ~]# systemctl status etcd

10.验证集群

[root@linux-node1 ~]# 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

如果etcd启动错误:可以用 journalctl -xe -u etcd查看日志

我这里是证书生成有问题。原因：在第一步 etcd创建证书签名请求时ip写错了。无语。改正ip重新生成证书并即可。

3.K8S部署-------- 部署ETCD集群

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