Question

我的服务器上有以下弹性搜索配置文件。

#!/bin/sh
#
# /etc/init.d/elasticsearch -- startup script for Elasticsearch
#
# Written by Miquel van Smoorenburg <miquels@cistron.nl>.
# Modified for Debian GNU/Linux by Ian Murdock <imurdock@gnu.ai.mit.edu>.
# Modified for Tomcat by Stefan Gybas <sgybas@debian.org>.
# Modified for Tomcat6 by Thierry Carrez <thierry.carrez@ubuntu.com>.
# Additional improvements by Jason Brittain <jason.brittain@mulesoft.com>.
# Modified by Nicolas Huray for Elasticsearch <nicolas.huray@gmail.com>.
#
### BEGIN INIT INFO
# Provides:          elasticsearch
# Required-Start:    $network $remote_fs $named
# Required-Stop:     $network $remote_fs $named
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Starts elasticsearch
# Description:       Starts elasticsearch using start-stop-daemon
### END INIT INFO
PATH=/bin:/usr/bin:/sbin:/usr/sbin
NAME=elasticsearch
DESC="Elasticsearch Server"
DEFAULT=/etc/default/$NAME

if [ `id -u` -ne 0 ]; then
    echo "You need root privileges to run this script"
    exit 1
fi

echo "Statement before >>>>"
. /lib/lsb/init-functions
echo "Statement after >>>>>"

if [ -r /etc/default/rcS ]; then
    . /etc/default/rcS
fi

# The following variables can be overwritten in $DEFAULT

# Run Elasticsearch as this user ID and group ID
ES_USER=elasticsearch
ES_GROUP=elasticsearch

# Directory where the Elasticsearch binary distribution resides
ES_HOME=/usr/share/$NAME

# Heap size defaults to 256m min, 1g max
# Set ES_HEAP_SIZE to 50% of available RAM, but no more than 31g
#ES_HEAP_SIZE=2g

# Heap new generation
#ES_HEAP_NEWSIZE=

# max direct memory
#ES_DIRECT_SIZE=

# Additional Java OPTS
#ES_JAVA_OPTS=

# Maximum number of open files
MAX_OPEN_FILES=65535

# Maximum amount of locked memory
#MAX_LOCKED_MEMORY=

# Elasticsearch log directory
LOG_DIR=/var/log/$NAME

# Elasticsearch data directory
DATA_DIR=/var/lib/$NAME

# Elasticsearch configuration directory
CONF_DIR=/etc/$NAME

# Maximum number of VMA (Virtual Memory Areas) a process can own
MAX_MAP_COUNT=262144

# Path to the GC log file
#ES_GC_LOG_FILE=/var/log/elasticsearch/gc.log

# Elasticsearch PID file directory
PID_DIR="/var/run/elasticsearch"

# Elasticsearch Repo directory
REPO_DIR="/mnt/backups"

# End of variables that can be overwritten in $DEFAULT

# overwrite settings from default file
if [ -f "$DEFAULT" ]; then
    . "$DEFAULT"
fi
# CONF_FILE setting was removed
if [ ! -z "$CONF_FILE" ]; then
    echo "CONF_FILE setting is no longer supported. elasticsearch.yml must be placed in the config directory and cannot be renamed."
    exit 1
fi

# Define other required variables
PID_FILE="$PID_DIR/$NAME.pid"
DAEMON=$ES_HOME/bin/elasticsearch
DAEMON_OPTS="-d -p $PID_FILE --default.path.home=$ES_HOME --default.path.logs=$LOG_DIR --default.path.data=$DATA_DIR --default.path.conf=$CONF_DIR --default.path.repo=$REPO_DIR"
export ES_HEAP_SIZE
export ES_HEAP_NEWSIZE
export ES_DIRECT_SIZE
export ES_JAVA_OPTS
export ES_GC_LOG_FILE
export JAVA_HOME

# Check DAEMON exists
test -x $DAEMON || exit 0

checkJava() {
    if [ -x "$JAVA_HOME/bin/java" ]; then
        JAVA="$JAVA_HOME/bin/java"
    else
        JAVA=`which java`
    fi

    if [ ! -x "$JAVA" ]; then
        echo "Could not find any executable java binary. Please install java in your PATH or set JAVA_HOME"
        exit 1
    fi
}

case "$1" in
  start)
    checkJava

    if [ -n "$MAX_LOCKED_MEMORY" -a -z "$ES_HEAP_SIZE" ]; then
        log_failure_msg "MAX_LOCKED_MEMORY is set - ES_HEAP_SIZE must also be set"
        exit 1
    fi

    log_daemon_msg "Starting $DESC"

    pid=`pidofproc -p $PID_FILE elasticsearch`
    if [ -n "$pid" ] ; then
        log_begin_msg "Already running.1"
        log_end_msg 0
        exit 0
    fi

    # Prepare environment
    mkdir -p "$LOG_DIR" "$DATA_DIR" && chown "$ES_USER":"$ES_GROUP" "$LOG_DIR" "$DATA_DIR"

    # Ensure that the PID_DIR exists (it is cleaned at OS startup time)
    if [ -n "$PID_DIR" ] && [ ! -e "$PID_DIR" ]; then
        mkdir -p "$PID_DIR" && chown "$ES_USER":"$ES_GROUP" "$PID_DIR"
    fi
    if [ -n "$PID_FILE" ] && [ ! -e "$PID_FILE" ]; then
        touch "$PID_FILE" && chown "$ES_USER":"$ES_GROUP" "$PID_FILE"
    fi

    if [ -n "$MAX_OPEN_FILES" ]; then
        ulimit -n $MAX_OPEN_FILES
    fi

    if [ -n "$MAX_LOCKED_MEMORY" ]; then
        ulimit -l $MAX_LOCKED_MEMORY
    fi

    if [ -n "$MAX_MAP_COUNT" -a -f /proc/sys/vm/max_map_count ]; then
        sysctl -q -w vm.max_map_count=$MAX_MAP_COUNT
    fi
        echo "Staring......."
        echo $DAEMON_OPTS
    # Start Daemon
    start-stop-daemon -d $ES_HOME --start -b --user "$ES_USER" -c "$ES_USER" --pidfile "$PID_FILE" --exec $DAEMON -- $DAEMON_OPTS
    return=$?
    if [ $return -eq 0 ]; then
        i=0
        timeout=10
        # Wait for the process to be properly started before exiting
        until { cat "$PID_FILE" | xargs kill -0; } >/dev/null 2>&1
        do
            sleep 1
            i=$(($i + 1))
            if [ $i -gt $timeout ]; then
                log_end_msg 1
                exit 1
            fi
        done
    fi
    log_end_msg $return
    exit $return
    ;;
  stop)
    log_daemon_msg "Stopping $DESC"

    if [ -f "$PID_FILE" ]; then
        start-stop-daemon --stop --pidfile "$PID_FILE" \
            --user "$ES_USER" \
            --quiet \
            --retry forever/TERM/20 > /dev/null
        if [ $? -eq 1 ]; then
            log_progress_msg "$DESC is not running but pid file exists, cleaning up"
        elif [ $? -eq 3 ]; then
            PID="`cat $PID_FILE`"
            log_failure_msg "Failed to stop $DESC (pid $PID)"
            exit 1
        fi
        rm -f "$PID_FILE"
    else
        log_progress_msg "(not running)"
    fi
    log_end_msg 0
    ;;
  status)
    status_of_proc -p $PID_FILE elasticsearch elasticsearch && exit 0 || exit $?
    ;;
  restart|force-reload)
    if [ -f "$PID_FILE" ]; then
        $0 stop
        sleep 1
    fi
    $0 start
    ;;
  *)
    log_success_msg "Usage: $0 {start|stop|restart|force-reload|status}"
    exit 1
    ;;
esac

exit 0

注意

echo "Statement before >>>>"
. /lib/lsb/init-functions
echo "Statement after >>>>>"

现在，有时我运行上面的脚本，我看到Statement before >>>>正在打印，但不是 Statement after >>>>

原因：我对DAEMON_OPTS变量进行了一些更改，但每次重新启动弹性搜索时，我都看不到应用的选项（当我执行ps aux | grep elasticsearch时）

@rici：

Distributor ID: Debian
Description:    Debian GNU/Linux 8.3 (jessie)
Release:    8.3
Codename:   jessie

dpkg -S "$(ps -ocmd= 1)"
systemd-sysv: /sbin/init

Answer 1

您的服务器正在使用systemd init system，这意味着您可能无法编辑init.d脚本并希望更改能够反映在您的启动过程中。

与upstart一样，systemd会修改/lib/lsb/init-functions。在SysV中，这个文件只是一组有用的shell函数，几乎所有的init脚本都使用它们。所以该文件包含在每个init脚本的开头附近。（Debian的包linter实际上会检查以确保是这种情况。）因此systemd（和upstart）可以将代码插入到运行备用服务控制命令的文件中。对于systemd init-functions，文件调用systemd servicectl，它使用systemd配置文件作为服务，然后退出。（Upstart exec是其服务控制器，具有相同的最终效果。）

systemd中还有一个“生成器”，它试图为所有旧的init.d服务创建系统配置文件[注1]，但在弹性搜索的情况下，这可能不相关，因为弹性搜索似乎附带{ {3}}

因此，为了更改您的elasticsearch启动配置，您必须修改systemd configuration files。

似乎相对清楚的是，您在问题中显示的init脚本不是实际运行以启动服务的脚本。比较脚本中的日志记录行：

DESC="Elasticsearch Server"
#...
log_daemon_msg "Starting $DESC"

实际观察到输出：

[Ok] Starting elasticsearch (via systemctl): elasticsearch.service.

无论log_daemon_msg做什么，都不可能将Elasticsearch Server更改为elasticsearch，而实际生成的输出行显然来自systemd。

注释

systemd service entry对systemd遗留系统进行了有趣的讨论 - “systemd sysv init兼容模式很神奇” - 尽管第一条评论（来自John Carver）似乎也很有趣。但我认为这与你的问题无关。

Answer 2

请阅读@rici答案以获得解释。以下答案仅包含少量添加信息。

所以，正如@rici指出的那样。

Like upstart, systemd modifies /lib/lsb/init-functions

如果仔细检查/lib/lsb/init-functions

最后几行看起来像这样。

for hook in $(run-parts --lsbsysinit --list /lib/lsb/init-functions.d 2>/dev/null); do
    [ -r $hook ] && . $hook || true
done

这里调用（或调用）/lib/lsb/init-functions.d/40-systemd

此外，还必须阅读this以及

为什么回声从不打印

2 个答案:

注释