etcd

# 安装[etcd](https://github.com/etcd-io/etcd/releases/ 'Github etcd Release')
## 说明

- version选项会打印默认的安装版本，填写版本为参数时从网络安装指定版本
- source选项会可以选择从google还是github源下载安装文件

## 使用方法
```shell
Install etcd

Usage: install.sh [OPTIONS] [OPTARGS]

Options:
  -h                         get help message
  --version=[version]        print default install version or install specific version
  --source=[google|github]   choose install source. default: google
```

## 脚本内容

```
#!/usr/bin/env bash
ETCD_VER=v3.5.1
INSTALL_DIR=/usr/local/etcd
_ME=${0##*/}

# init jobs
if [[ ! -d $INSTALL_DIR ]] ; then
mkdir -p $INSTALL_DIR/data
fi

if [[ -d $INSTALL_DIR/Documentation ]] ; then
    rm -rf $INSTALL_DIR/Documentation
fi

_install_from_internet() {
# choose either URL
GOOGLE_URL=https://storage.googleapis.com/etcd
GITHUB_URL=https://github.com/etcd-io/etcd/releases/download
if [[ $INSTALL_SOURCE == 'github' ]] ; then
    DOWNLOAD_URL=${GITHUB_URL}
else
    DOWNLOAD_URL=${GOOGLE_URL}
fi

rm -f /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz
rm -rf $INSTALL_DIR && mkdir -p $INSTALL_DIR

curl -L ${DOWNLOAD_URL}/${ETCD_VER}/etcd-${ETCD_VER}-linux-amd64.tar.gz -o /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz
tar xzvf /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz -C $INSTALL_DIR --strip-components=1
rm -f /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz

ln -fs $INSTALL_DIR/etcd /usr/bin/
ln -fs $INSTALL_DIR/etcdctl /usr/bin/
ln -fs $INSTALL_DIR/etcdutl /usr/bin/
_start_etcd
}

_install_from_file() {
\cp -rPf files/$ETCD_VER/* $INSTALL_DIR/
ln -fs $INSTALL_DIR/etcd /usr/bin/
ln -fs $INSTALL_DIR/etcdctl /usr/bin/
ln -fs $INSTALL_DIR/etcdutl /usr/bin/
_start_etcd
}

_start_etcd() {

cat > /etc/systemd/system/etcd.service <<EOF
[Unit]
Description=etcd
After=network.target remote-fs.target
[Service]
Type=notify
User=root

LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TasksMax=infinity

Restart=on-failure
RestartSec=5s
PIDFile=/var/run/etcd.pid
ExecStart=/usr/bin/etcd \\
  --name s1 \\
  --data-dir $INSTALL_DIR/data \\
  --listen-client-urls http://0.0.0.0:2379 \\
  --advertise-client-urls http://0.0.0.0:2379 \\
  --listen-peer-urls http://0.0.0.0:2380 \\
  --initial-advertise-peer-urls http://0.0.0.0:2380 \\
  --initial-cluster s1=http://0.0.0.0:2380 \\
  --initial-cluster-token tkn \\
  --initial-cluster-state new

ExecReload=/bin/kill -s HUP \$MAINPID
ExecStop=/bin/kill -s QUIT \$MAINPID

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload &&  systemctl enable etcd
systemctl restart etcd
}

_install_method() {
if [[ -d files/$ETCD_VER ]]; then
    echo "install from file"
    _install_from_file
else
    echo "install from internet"
    _install_from_internet
fi
}

_usage() {
cat <<EOF
Install etcd

Usage: $_ME [OPTIONS] [OPTARGS]

Options:
  -h                         get help message
  --version=[version]        print default install version or install specific version
  --source=[google|github]   choose install source. default: google
EOF

}

_main() {
ARGS=`getopt -o h -l version::,source::,help -n "$0" -- "$@"`
if [ $? != 0 ]; then
    echo -ne "Wrong values!"
    _usage
    exit 1
fi

eval set -- "${ARGS}"

while true
do
    case "$1" in
        -v|--version)
            ETCD_VER=${2:-v3.5.1}
            echo "Version: $ETCD_VER"
            if [[ $ETCD_VER == 'v3.5.1' ]] ; then
                exit 0
            else
                shift
            fi
            ;;
        -s|--source)
            INSTALL_SOURCE=${2:-google}
            shift 2
            ;;
        -h|--help)
            _usage
            exit 0
            ;;
        --)
            shift
            break
            ;;
        *)
            break
            ;;
    esac
done
_install_method
}

_main $@
```