Etcd是Kubernetes集群中的一个十分重要的组件，用于保存集群所有的网络配置和对象的状态信息,K8S中所有持久化的状态信息都是以Key-Value的形式存储在etcd中，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，本实验中在三台主机上都部署上etcd.

一、创建etcd的配置文件

2379端口用于外部通信，2380用于内部通信

承接上文：https://www.cnblogs.com/yangzp/p/15692046.html

master 操作：

yang@master:/opt/kubernetes/$ sudo mkdir -p /opt/kubernetes/cfg

yang@master:/opt/kubernetes/cfg$ sudo nano /opt/kubernetes/cfg/etcd.conf

#[member]

##ETCD节点名称修改，这个ETCD_NAME每个节点必须不同

ETCD_NAME="etcd-node1"

#ETCD数据目录

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"

#ETCD_SNAPSHOT_COUNTER="10000"

#ETCD_HEARTBEAT_INTERVAL="100"

#ETCD_ELECTION_TIMEOUT="1000"

#

##ETCD监听的URL，每个节点不同需要修改

ETCD_LISTEN_PEER_URLS="https://192.168.1.106:2380"

#外部通信监听URL修改，每个节点不同需要修改

ETCD_LISTEN_CLIENT_URLS="https://192.168.1.106:2379,https://127.0.0.1:2379"

#ETCD_MAX_SNAPSHOTS="5"

#ETCD_MAX_WALS="5"

#ETCD_CORS=""

#[cluster]

ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.106:2380"

# if you use different ETCD_NAME (e.g. test),

# set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."

ETCD_INITIAL_CLUSTER="etcd-node1=https://192.168.1.106:2380,etcd-node2=https://192.168.1.108:2380,etcd-node3=https://192.168.1.109:2380"

ETCD_INITIAL_CLUSTER_STATE="new"

ETCD_INITIAL_CLUSTER_TOKEN="k8s-etcd-cluster"

ETCD_ADVERTISE_CLIENT_URLS="https://192.168.1.106:2379"

#[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"

node1 操作：

yang@node1:/opt/kubernetes/$ sudo mkdir -p /opt/kubernetes/cfg

yang@node1:/opt/kubernetes/cfg$ sudo nano /opt/kubernetes/cfg/etcd.conf

#[member]

##ETCD节点名称修改，这个ETCD_NAME每个节点必须不同

ETCD_NAME="etcd-node2"

#ETCD数据目录

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"

#ETCD_SNAPSHOT_COUNTER="10000"

#ETCD_HEARTBEAT_INTERVAL="100"

#ETCD_ELECTION_TIMEOUT="1000"

##ETCD监听的URL，每个节点不同需要修改

ETCD_LISTEN_PEER_URLS="https://192.168.1.108:2380"

#外部通信监听URL修改，每个节点不同需要修改

ETCD_LISTEN_CLIENT_URLS="https://192.168.1.108:2379,https://127.0.0.1:2379"

#ETCD_MAX_SNAPSHOTS="5"

#ETCD_MAX_WALS="5"

#ETCD_CORS=""

#[cluster]

ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.108:2380"

# if you use different ETCD_NAME (e.g. test),

# set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."

# #添加集群访问

ETCD_INITIAL_CLUSTER="etcd-node1=https://192.168.1.106:2380,etcd-node2=https://192.168.1.108:2380,etcd-node3=https://192.168.1.109:2380"

ETCD_INITIAL_CLUSTER_STATE="new"

ETCD_INITIAL_CLUSTER_TOKEN="k8s-etcd-cluster"

ETCD_ADVERTISE_CLIENT_URLS="https://192.168.1.108:2379"

#[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"

node2 操作：

yang@node2:/opt/kubernetes/$ sudo mkdir -p /opt/kubernetes/cfg

yang@node2:/opt/kubernetes/cfg$ cat /opt/kubernetes/cfg/etcd.conf

#[member]

##ETCD节点名称修改，这个ETCD_NAME每个节点必须不同

ETCD_NAME="etcd-node3"

#ETCD数据目录

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"　　

#ETCD_SNAPSHOT_COUNTER="10000"

#ETCD_HEARTBEAT_INTERVAL="100"

#ETCD_ELECTION_TIMEOUT="1000"

##ETCD监听的URL，每个节点不同需要修改

ETCD_LISTEN_PEER_URLS="https://192.168.1.109:2380"

#外部通信监听URL修改，每个节点不同需要修改

ETCD_LISTEN_CLIENT_URLS="https://192.168.1.109:2379,https://127.0.0.1:2379"

#ETCD_MAX_SNAPSHOTS="5"

#ETCD_MAX_WALS="5"

#ETCD_CORS=""

#[cluster]

ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.109:2380"

# if you use different ETCD_NAME (e.g. test),

# set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."

# 添加集群访问

ETCD_INITIAL_CLUSTER="etcd-node1=https://192.168.1.106:2380,etcd-node2=https://192.168.1.108:2380,etcd-node3=https://192.168.1.109:2380"

ETCD_INITIAL_CLUSTER_STATE="new"

ETCD_INITIAL_CLUSTER_TOKEN="k8s-etcd-cluster"

ETCD_ADVERTISE_CLIENT_URLS="https://192.168.1.109:2379"

#[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"

二 、创建etcd系统服务

master 创建：

yang@master:/opt/kubernetes/cfg$ sudo nano /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

node1 创建：

yang@node1:/opt/kubernetes/cfg$ sudo nano /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

node2 创建：

yang@node2:/opt/kubernetes/cfg$ sudo nano /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

三、重新加载系统服务

1、在master 、node1 、node2 三台服务器上重新加载并设置开机启动etcd系统服务

yang@master:/opt/kubernetes/cfg$ sudo systemctl daemon-reload

yang@master:/opt/kubernetes/cfg$ sudo systemctl enable etcd

2、默认不会创建etcd的数据存储目录，这里在三个节点上创建etcd数据存储目录并启动etcd

yang@master:/opt/kubernetes/cfg$ sudo  mkdir /var/lib/etcd

yang@master:/opt/kubernetes/cfg$ sudo systemctl start etcd

yang@master:/opt/kubernetes/cfg$ sudo systemctl status etcd

yang@node1:/opt/kubernetes/cfg$ sudo  mkdir /var/lib/etcd

yang@node1:/opt/kubernetes/cfg$ sudo systemctl start etcd

yang@node1:/opt/kubernetes/cfg$ sudo systemctl status etcd

yang@node2:/opt/kubernetes/cfg$ sudo  mkdir /var/lib/etcd

yang@node2:/opt/kubernetes/cfg$ sudo systemctl start etcd

yang@node2:/opt/kubernetes/cfg$ sudo systemctl status etcd

3、查看三台服务器监听的2379 和2380端口

master 查看：

yang@master:/opt/kubernetes/cfg$ sudo apt install net-tools

yang@master:/opt/kubernetes/cfg$ netstat -antpl

(Not all processes could be identified, non-owned process info

 will not be shown, you would have to be root to see it all.)

Active Internet connections (servers and established)

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name

tcp        0      0 192.168.1.106:2379      0.0.0.0:*               LISTEN      -

tcp        0      0 127.0.0.1:2379          0.0.0.0:*               LISTEN      -

tcp        0      0 192.168.1.106:2380      0.0.0.0:*               LISTEN      -

tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      -

tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      -

tcp        0      0 127.0.0.1:6010          0.0.0.0:*               LISTEN      -

tcp        0      0 192.168.1.106:53248     192.168.1.108:2380      ESTABLISHED -

tcp        0      0 192.168.1.106:53250     192.168.1.108:2380      ESTABLISHED -

tcp        0     36 192.168.1.106:22        192.168.1.114:64179     ESTABLISHED -

tcp        0      0 192.168.1.106:2380      192.168.1.108:46790     ESTABLISHED -

tcp        0      0 127.0.0.1:38788         127.0.0.1:2379          ESTABLISHED -

tcp        0      0 192.168.1.106:2380      192.168.1.109:36012     ESTABLISHED -

tcp        0      0 192.168.1.106:2380      192.168.1.108:46778     ESTABLISHED -

tcp        0      0 192.168.1.106:2380      192.168.1.108:46780     ESTABLISHED -

tcp        0      0 192.168.1.106:53260     192.168.1.108:2380      ESTABLISHED -

tcp        0      0 192.168.1.106:2380      192.168.1.109:36008     ESTABLISHED -

tcp        0      0 192.168.1.106:2380      192.168.1.109:36000     ESTABLISHED -

tcp        0      0 192.168.1.106:33486     192.168.1.109:2380      ESTABLISHED -

tcp        0      0 127.0.0.1:2379          127.0.0.1:38788         ESTABLISHED -

tcp        0      0 192.168.1.106:2379      192.168.1.106:39984     ESTABLISHED -

tcp        0      0 192.168.1.106:33476     192.168.1.109:2380      ESTABLISHED -

tcp        0      0 192.168.1.106:2380      192.168.1.109:35998     ESTABLISHED -

tcp        0      0 192.168.1.106:33478     192.168.1.109:2380      ESTABLISHED -

tcp        0      0 192.168.1.106:39984     192.168.1.106:2379      ESTABLISHED -

tcp6       0      0 :::22                   :::*                    LISTEN      -

tcp6       0      0 ::1:6010                :::*                    LISTEN      -

node1 查看：

yang@node1:/opt/kubernetes/cfg$ netstat -antpl

(Not all processes could be identified, non-owned process info

 will not be shown, you would have to be root to see it all.)

Active Internet connections (servers and established)

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name

tcp        0      0 127.0.0.1:6010          0.0.0.0:*               LISTEN      -

tcp        0      0 192.168.1.108:2379      0.0.0.0:*               LISTEN      -

tcp        0      0 127.0.0.1:2379          0.0.0.0:*               LISTEN      -

tcp        0      0 192.168.1.108:2380      0.0.0.0:*               LISTEN      -

tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      -

tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      -

tcp        0      0 192.168.1.108:44020     192.168.1.108:2379      ESTABLISHED -

tcp        0      0 192.168.1.108:2380      192.168.1.109:60836     ESTABLISHED -

tcp        0      0 192.168.1.108:2380      192.168.1.106:53260     ESTABLISHED -

tcp        0      0 192.168.1.108:2379      192.168.1.108:44020     ESTABLISHED -

tcp        0      0 192.168.1.108:2380      192.168.1.106:53248     ESTABLISHED -

tcp        0      0 192.168.1.108:53444     192.168.1.109:2380      ESTABLISHED -

tcp        0      0 192.168.1.108:53452     192.168.1.109:2380      ESTABLISHED -

tcp        0      0 192.168.1.108:46778     192.168.1.106:2380      ESTABLISHED -

tcp        0      0 192.168.1.108:46780     192.168.1.106:2380      ESTABLISHED -

tcp        0      0 192.168.1.108:46790     192.168.1.106:2380      ESTABLISHED -

tcp        0      0 192.168.1.108:2380      192.168.1.109:60842     ESTABLISHED -

tcp        0      0 192.168.1.108:2380      192.168.1.109:60848     ESTABLISHED -

tcp        0      0 192.168.1.108:2380      192.168.1.106:53250     ESTABLISHED -

tcp        0      0 192.168.1.108:53442     192.168.1.109:2380      ESTABLISHED -

tcp        0      0 192.168.1.108:2380      192.168.1.109:60856     ESTABLISHED -

tcp        0      0 127.0.0.1:60782         127.0.0.1:2379          ESTABLISHED -

tcp        0     36 192.168.1.108:22        192.168.1.114:64184     ESTABLISHED -

tcp        0      0 127.0.0.1:2379          127.0.0.1:60782         ESTABLISHED -

tcp6       0      0 ::1:6010                :::*                    LISTEN      -

tcp6       0      0 :::22                   :::*                    LISTEN      -

node2 查看：

yang@node2:/opt/kubernetes/cfg$ netstat -antpl

(Not all processes could be identified, non-owned process info

 will not be shown, you would have to be root to see it all.)

Active Internet connections (servers and established)

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name

tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      -

tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      -

tcp        0      0 127.0.0.1:6010          0.0.0.0:*               LISTEN      -

tcp        0      0 192.168.1.109:2379      0.0.0.0:*               LISTEN      -

tcp        0      0 127.0.0.1:2379          0.0.0.0:*               LISTEN      -

tcp        0      0 192.168.1.109:2380      0.0.0.0:*               LISTEN      -

tcp        0      0 192.168.1.109:2380      192.168.1.106:33478     ESTABLISHED -

tcp        0      0 192.168.1.109:36008     192.168.1.106:2380      ESTABLISHED -

tcp        0      0 192.168.1.109:2380      192.168.1.106:33476     ESTABLISHED -

tcp        0      0 192.168.1.109:36000     192.168.1.106:2380      ESTABLISHED -

tcp        0      0 192.168.1.109:2380      192.168.1.106:33486     ESTABLISHED -

tcp        0      0 192.168.1.109:60842     192.168.1.108:2380      ESTABLISHED -

tcp        0      0 192.168.1.109:2379      192.168.1.109:37924     ESTABLISHED -

tcp        0      0 192.168.1.109:36012     192.168.1.106:2380      ESTABLISHED -

tcp        0      0 192.168.1.109:37924     192.168.1.109:2379      ESTABLISHED -

tcp        0     36 192.168.1.109:22        192.168.1.114:64185     ESTABLISHED -

tcp        0      0 127.0.0.1:2379          127.0.0.1:57926         ESTABLISHED -

tcp        0      0 192.168.1.109:60856     192.168.1.108:2380      ESTABLISHED -

tcp        0      0 192.168.1.109:2380      192.168.1.108:53452     ESTABLISHED -

tcp        0      0 192.168.1.109:35998     192.168.1.106:2380      ESTABLISHED -

tcp        0      0 192.168.1.109:60848     192.168.1.108:2380      ESTABLISHED -

tcp        0      0 192.168.1.109:60836     192.168.1.108:2380      ESTABLISHED -

tcp        0      0 127.0.0.1:57926         127.0.0.1:2379          ESTABLISHED -

tcp        0      0 192.168.1.109:2380      192.168.1.108:53442     ESTABLISHED -

tcp        0      0 192.168.1.109:2380      192.168.1.108:53444     ESTABLISHED -

tcp6       0      0 :::22                   :::*                    LISTEN      -

tcp6       0      0 ::1:6010                :::*                    LISTEN      -

四、验证ETCD集群

master 操作：

yang@master:/opt/kubernetes/bin$ etcdctl --endpoints=https://192.168.1.106:2379 --ca-file=/opt/kubernetes/ssl/ca.pem --cert-file=/opt/kubernetes/ssl/etcd.pem  --key-file=/opt/kubernetes/ssl/etcd-key.pem cluster-health

Command 'etcdctl' not found, but can be installed with:

sudo apt install etcd-client

yang@master:/opt/kubernetes/bin$ sudo apt install etcd-client

Reading package lists... Done

Building dependency tree

Reading state information... Done

The following NEW packages will be installed:

  etcd-client

0 upgraded, 1 newly installed, 0 to remove and 44 not upgraded.

Need to get 4,563 kB of archives.

After this operation, 17.2 MB of additional disk space will be used.

Get:1 http://mirrors.aliyun.com/ubuntu focal/universe amd64 etcd-client amd64 3.2.26+dfsg-6 [4,563 kB]

Fetched 4,563 kB in 2s (2,398 kB/s)

Selecting previously unselected package etcd-client.

(Reading database ... 71849 files and directories currently installed.)

Preparing to unpack .../etcd-client_3.2.26+dfsg-6_amd64.deb ...

Unpacking etcd-client (3.2.26+dfsg-6) ...

Setting up etcd-client (3.2.26+dfsg-6) ...

Processing triggers for man-db (2.9.1-1) ...

yang@master:/opt/kubernetes/bin$ sudo etcdctl --endpoints=https://192.168.1.106:2379 --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 1baa0a58b574d69b is healthy: got healthy result from https://192.168.1.108:2379

member 39133e181b350a4e is healthy: got healthy result from https://192.168.1.106:2379

member 69fb6a35f1ce3d83 is healthy: got healthy result from https://192.168.1.109:2379

cluster is healthy

至此，etcd 部署完毕！

参考：https://blog.csdn.net/qq_34261373/article/details/90052220　

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