像守护进程一样运行 solr

Question

我尝试让 solr 在 /etc/init.d/solr 中作为启动脚本运行。这是我从 How to start Solr automatically?

复制粘贴的脚本

#!/bin/sh

# Prerequisites:
# 1. Solr needs to be installed at /usr/local/solr/example
# 2. daemon needs to be installed
# 3. Script needs to be executed by root

# This script will launch Solr in a mode that will automatically respawn if it
# crashes. Output will be sent to /var/log/solr/solr.log. A PID file will be
# created in the standard location.

# Comments to support chkconfig on Red Hat Linux
# chkconfig: 2345 64 36
# Description: A very fast and reliable search engine.
# processname solr

# Source function library.
. /etc/init.d/functions

start () {
    echo -n "Starting solr..."

    # start daemon
    daemon --chdir='/usr/local/solr/example' --command "java -jar start.jar" --respawn --output=/var/log/solr/solr.log --name=solr --verbose

    RETVAL=$?
    if [ $RETVAL = 0 ]
    then
        echo "done."
    else
        echo "failed. See error code for more information."
    fi
    return $RETVAL
}

stop () {
    # stop daemon
    echo -n "Stopping solr..."

    daemon --stop --name=solr  --verbose
    RETVAL=$?

    if [ $RETVAL = 0 ]
    then
        echo "done."
    else
        echo "failed. See error code for more information."
    fi
    return $RETVAL
}


restart () {
    daemon --restart --name=solr  --verbose
}


status () {
    # report on the status of the daemon
    daemon --running --verbose --name=solr
    return $?
}


case "" in
    start)
        start
    ;;
    status)
        status
    ;;
    stop)
        stop
    ;;
    restart)
        restart
    ;;
    *)
        echo $"Usage: solr {start|status|stop|restart}"
        exit 3
    ;;
esac

exit $RETVAL

我按照上面的描述做了所有事情link。但是报错

service solr start
Starting solr.../etc/init.d/solr: Usage: daemon [+/-nicelevel] {program}
failed. See error code for more information.

正在阅读https://blog.hazrulnizam.com/create-init-script-centos-6/不明白为什么daemon写错了

Answer 1

这不起作用，因为 daemon 函数（来自 /etc/init.d/functions）自 2010 年（发布脚本时）以来发生了变化，不再接受相同的参数。您将需要重写 daemon 行以接受当前支持的参数。

我查看了 CentOS 6 机器上的 daemon 函数，看来您可以替换这一行：

daemon --chdir='/usr/local/solr/example' --command "java -jar start.jar" --respawn --output=/var/log/solr/solr.log --name=solr --verbose

只有这个：

daemon "java -jar /usr/local/solr/example/start.jar"

（假设 solr 安装在 /usr/local/solr/example）。

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