kubernetes集群安装指南：etcd集群部署

etcd 是基于 Raft 的分布式 key-value 存储系统，由 CoreOS 开发，常用于服务发现、共享配置以及并发控制（如 leader 选举、分布式锁等）。kubernetes 使用 etcd 存储所有运行数据。

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部署准备

所有操作都是在devops机器上操作，将相关脚本编辑好，然后通过ansible 脚本模块统一执行。

定义环境变量

#################### Variable parameter setting ######################
ETCD_INSTALL_PATH="/data/apps/k8s/etcd"
ETCD_BIN_DIR="${ETCD_INSTALL_PATH}/bin"
ETCD_DATA_DIR="${ETCD_INSTALL_PATH}/data"
ETCD_WAL_DIR="${ETCD_INSTALL_PATH}/wal"
N01="master-k8s-n01=https://10.10.10.22:2380"
N02="master-k8s-n02=https://10.10.10.23:2380"
N03="master-k8s-n03=https://10.10.10.24:2380"
ETCD_ENPOIDTS="$N01,$N02,$N03"
CA_PATH="/etc/k8s/ssl"
SOFTWARE="/root/software"
VERSION=v3.3.13
PACKAGE="etcd-${VERSION}-linux-amd64.tar.gz"
HOSTNAME=`hostname`
DOWNLOAD_URL="https://github.com/devops-apps/download/raw/master/etcd/${PACKAG}"
ETH_INTERFACE=eth2
LISTEN_IP=$(ifconfig | grep -A 1 ${ETH_INTERFACE} |grep inet |awk '{print $2}')
USER=k8s

下载和分发 etcd 二进制文件

登录devops访问etcd 的 release 页面下载最新版本的发布包并通过ansible同步到三个master三个节点/root/software目录下：

wget $DOWNLOAD_URL -P $SOFTWARE

2 部署etcd集群

在devops主机上使用ansible分别对三个master节点执行以下操作：

2.1 安装etcd二进制执行命令

### 1.Check if the install directory exists.
if [ ! -d $ETCD_BIN_DIR ]; then
     mkdir -p $ETCD_BIN_DIR
     mkdir -p $ETCD_DATA_DIR
     mkdir -p $ETCD_WAL_DIR
fi

### 2.Install etcd binary of kubernetes.
if [ ! -f "$SOFTWARE/etcd-${VERSION}-linux-amd64.tar.gz" ]; then
     sudo wget $DOWNLOAD_URL -P $SOFTWARE >>/tmp/install.log  2>&1
fi

cd $SOFTWARE && tar -xzf etcd-${VERSION}-linux-amd64.tar.gz -C ./
cp -fp etcd-${VERSION}-linux-amd64/etcd* $ETCD_BIN_DIR
ln -sf  $ETCD_BIN_DIR/{etcd,etcdctl} /usr/local/bin
sudo chmod -R 755 $ETCD_INSTALL_PATH
sudo chown -R $USER:$USER $ETCD_INSTALL_PATH

2.2 创建 etcd 的 systemd unit 启动服务文件

cat >/usr/lib/systemd/system/etcd.service<

systemctl  etcd.service start

systemctl status etcd|grep Active

sudo journalctl -u etcd

ETCDCTL_API=3 etcdctl \
  --endpoints=${ETCD_ENPOIDTS} \
  --cacert=/etc/k8s/ssl/ca.pem \
  --cert=/etc/k8s/ssl/etcd.pem \
  --key=/etc/k8s/ssl/etcd-key.pem endpoint health

当输出值为以下状态即为正常：
https://10.10.10.22:2379 is healthy: successfully committed proposal: took = 3.693346ms
https://10.10.10.23:2379 is healthy: successfully committed proposal: took = 2.80687ms
https://10.10.10.24:2379 is healthy: successfully committed proposal: took = 4.493037ms

ETCDCTL_API=3 etcdctl \
  --endpoints=${ETCD_ENPOIDTS} \
  --cacert=/etc/k8s/ssl/ca.pem \
  --cert=/etc/k8s/ssl/etcd.pem \
  --key=/etc/k8s/ssl/etcd-key.pem endpoint status

输出：
https://10.10.10.22:2379, 641670f7677ceff, 3.3.13, 2.9 MB, false, 2, 6198986
https://10.10.10.23:2379, ce37122364c277fa, 3.3.13, 2.9 MB, true, 2, 6198986
https://10.10.10.24:2379, 4d1003897626ccde, 3.3.13, 2.9 MB, false, 2, 6198986