simple to install nacos

nacos-install.sh

#!/bin/bash
VERSION="2.1.0"
DOWNLOAD_URL="https://github.com/alibaba/nacos/releases/download/${VERSION}/nacos-server-${VERSION}.tar.gz"
INSTALL_DIR=/usr/local/nacos-server-${VERSION}
LINK_PATH=/usr/local/nacos
TMP_DIR=/tmp/nacos

function check_error() {
    if [ $? == 1 ]; then
        echo $1
        exit 1
    fi
}

function install() {
    mkdir $TMP_DIR
    mkdir $INSTALL_DIR
    wget -O ${TMP_DIR}/nacos-server.tar.gz $DOWNLOAD_URL
    check_error "download binary error!"
    tar -zxf ${TMP_DIR}/nacos-server.tar.gz --strip-components 1 -C $INSTALL_DIR
    check_error "decompression error!"
    groupadd nacos
    useradd -g nacos -s /bin/false nacos
    chmod -R +x $INSTALL_DIR
    chown -R nacos:nacos $INSTALL_DIR
    ln -s $INSTALL_DIR $LINK_PATH
    rm -rf $TMP_DIR
    clear
    echo "run: ${LINK_PATH}/bin/startup.sh -m standalone"
    echo "after running on 0.0.0.0:8848"
}

function remove() {
    userdel nacos
    groupdel nacos
    rm -rf $LINK_PATH
    rm -rf $INSTALL_DIR
    clear
    echo "remove finished!"
}

function help() {
    cat << EOF
    nacos install helper!!!
    usage: 
    ./nacos.sh menu
    install: install nacos
    remove: remove nacos
EOF
}

function main() {
    if [ $# -lt 1 ]; then
        help
    else
        case $1 in
            install)
                install
            ;;
            remove)
                remove
            ;;
            *)
                echo 'command not found!'
                help
            ;;
        esac
    fi
    exit 0
}

main $@