ETCD集群部署
所有持久化的状态信息以KV的形式存储在ETCD中。类似zookeeper，提供分布式协调服务。之所以说kubenetes各个组件是无状态的，就是因为其中把数据都存放在ETCD中。由于ETCD支持集群，这里在三台主机上都部署上ETCD。
（1）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 #解压etcd [root@linux-node1 src]# cd etcd-v3.2.18-linux-amd64 #有2个文件，etcdctl是操作etcd的命令 [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 192.168.56.120:/opt/kubernetes/bin/ [root@linux-node1 etcd-v3.2.18-linux-amd64]# scp etcd etcdctl 192.168.56.130:/opt/kubernetes/bin/
（2）创建 etcd 证书签名请求
[root@linux-node1 ~]# cd /usr/local/src/ssl
[root@linux-node1 ssl]# vim etcd-csr.json { "CN": "etcd", "hosts": [ #此处的ip是etcd集群中各个节点的ip地址 "127.0.0.1", "192.168.56.110", "192.168.56.120", "192.168.56.130" ], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "ST": "BeiJing", "L": "BeiJing", "O": "k8s", "OU": "System" } ] }
（3）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@linux-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
（4）将证书拷贝到/opt/kubernetes/ssl目录下
[root@linux-node1 ~]# cp etcd*.pem /opt/kubernetes/ssl [root@linux-node1 ~]# scp etcd*.pem 192.168.56.120:/opt/kubernetes/ssl [root@linux-node1 ~]# scp etcd*.pem 192.168.56.130:/opt/kubernetes/ssl
（5）配置ETCD配置文件
2379端口用于外部通信，2380用于内部通信
[root@linux-node1 ~]# vim /opt/kubernetes/cfg/etcd.conf #[member] ETCD_NAME="etcd-node1" #ETCD节点名称修改，这个ETCD_NAME每个节点必须不同 ETCD_DATA_DIR="/var/lib/etcd/default.etcd" #ETCD数据目录 #ETCD_SNAPSHOT_COUNTER="10000" #ETCD_HEARTBEAT_INTERVAL="100" #ETCD_ELECTION_TIMEOUT="1000" ETCD_LISTEN_PEER_URLS="https://192.168.56.110:2380" #ETCD监听的URL，每个节点不同需要修改 ETCD_LISTEN_CLIENT_URLS="https://192.168.56.110:2379,https://127.0.0.1:2379" #外部通信监听URL修改，每个节点不同需要修改 #ETCD_MAX_SNAPSHOTS="5" #ETCD_MAX_WALS="5" #ETCD_CORS="" #[cluster] ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.56.110:2380" # 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://192.168.56.110:2380,etcd-node2=https://192.168.56.120:2380,etcd-node3=https://192.168.56.130:2380" #添加集群访问 ETCD_INITIAL_CLUSTER_STATE="new" ETCD_INITIAL_CLUSTER_TOKEN="k8s-etcd-cluster" ETCD_ADVERTISE_CLIENT_URLS="https://192.168.56.110:2379" #[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"
（6）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
（7）重新加载系统服务并拷贝etcd.conf和etcd.service文件到其他2个节点
[root@linux-node1 ~]# systemctl daemon-reload [root@linux-node1 ~]# systemctl enable etcd [root@linux-node1 ~]# scp /opt/kubernetes/cfg/etcd.conf 192.168.56.120:/opt/kubernetes/cfg/ [root@linux-node1 ~]# scp /etc/systemd/system/etcd.service 192.168.56.120:/etc/systemd/system/ [root@linux-node1 ~]# scp /opt/kubernetes/cfg/etcd.conf 192.168.56.130:/opt/kubernetes/cfg/ [root@linux-node1 ~]# scp /etc/systemd/system/etcd.service 192.168.56.130:/etc/systemd/system/ 拷贝过去的etcd.conf在node2和node3需要进行修改4处的ip地址，举例修改node2如下： [root@linux-node2 ~]# vim /opt/kubernetes/cfg/etcd.conf ETCD_NAME="etcd-node2" ETCD_LISTEN_PEER_URLS="https://192.168.56.120:2380" ETCD_LISTEN_CLIENT_URLS="https://192.168.56.120:2379,https://127.0.0.1:2379"
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.56.120:2380" ETCD_ADVERTISE_CLIENT_URLS="https://192.168.56.120:2379"
默认不会创建etcd的数据存储目录，这里在所有节点上创建etcd数据存储目录并启动etcd
[root@linux-node1 ~]# mkdir /var/lib/etcd [root@linux-node1 ~]# systemctl start etcd [root@linux-node1 ~]# systemctl status etcd [root@linux-node2 ~]# mkdir /var/lib/etcd [root@linux-node2 ~]# systemctl start etcd [root@linux-node2 ~]# systemctl status etcd [root@linux-node3 ~]# mkdir /var/lib/etcd [root@linux-node3 ~]# systemctl start etcd [root@linux-node3 ~]# systemctl status etcd [root@linux-node1 ssl]# netstat -tulnp |grep etcd #在各节点上查看是否监听了2379和2380端口
tcp 0 0 192.168.56.11:2379 0.0.0.0:* LISTEN 4916/etcd tcp 0 0 127.0.0.1:2379 0.0.0.0:* LISTEN 4916/etcd tcp 0 0 192.168.56.11:2380 0.0.0.0:* LISTEN 4916/etcd
（8）验证ETCD集群
[root@linux-node1 ~]# etcdctl --endpoints=https://192.168.56.110:2379 --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://192.168.56.120:2379 member 6566e06d7343e1bb is healthy: got healthy result from https://192.168.56.110:2379 member ce7b884e428b6c8c is healthy: got healthy result from https://192.168.56.130:2379 cluster is healthy #表明ETCD集群是正常的！！！