1、安装JDK13
    解压缩：
    tar -xvf jdk-13.0.2_linux-x64_bin.tar -C /home
    修改环境变量：
    vim /etc/profile
    添加：
    export JAVA_HOME=/home/jdk-13.0.2
    export JRE_HOME=${JAVA_HOME}/jre
    export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
    export PATH=${JAVA_HOME}/bin:$PATH
    生效：
    source /etc/profile
    验证：
    java -version
    2、解压缩：
    tar -xvf crate-ce-4.0.3-1b7058f.tar -C /home
    mv /home/crate-ce-4.0.3-1b7058f /home/crate-ce-4.0.3
    3、新建启动用户：
    useradd crate
    passwd crate
    chown -R crate /home/crate-ce-4.0.3
    4、调整系统配置：
    cat >> /etc/security/limits.conf <<-EOF
    crate soft nofile 65536
    crate hard nofile 65536
    EOF

    echo ‘vm.max_map_count=655360’ >> /etc/sysctl.conf && sysctl -p
    5、修改组件配置
    cluster.name: neusoft
    node.name: node1
    stats.enabled: true
    network.bind_host: 0.0.0.0
    network.publish_host: 172.25.20.43
    gateway.recover_after_nodes: 4
    gateway.expected_nodes: 5
    discovery.seed_hosts: [“172.25.20.39:4300”, “172.25.20.41:4300”, “172.25.20.42:4300”, “172.25.20.43:4300”, “172.25.20.44:4300”]
    cluster.initial_master_nodes: [“172.25.20.39:4300”, “172.25.20.41:4300”, “172.25.20.42:4300”, “172.25.20.43:4300”, “172.25.20.44:4300”]
    6、使用crate启动：
    export CRATE_HEAP_SIZE=8G
    cd bin
    nohup ./crate &