elasticsearch：启动时指定jdk版本。

我就是我 2023-07-13 08:08 12阅读 0赞

# 背景 #

我电脑环境的jdk是1.7，而需要的版本为1.8. 因此需要给elasticsearch指定jdk1.8（不需要将jdk1.8配置到环境变量）.

# 下载 #

1.  jdk:点击下载jdk1.8
2.  解压

tar -xvf xxx1.8.tar.gz

# 配置 #

##    修改elasticsearch启动脚本  ##

打开 elasticsearchHOME/bin/elasticsearch 编辑

[root]# vim bin/elasticsearch
    添加以下代码
    export JAVA_HOME=/home/hiekay/jdk1.8.0_181/      （此处配置的为刚下的1.8的配置目录）
    export PATH=$JAVA_HOME/bin:$PATH
    
    if [ -x "$JAVA_HOME/bin/java" ]; then
            JAVA="/home/yutao/jdk1.8.0_121/bin/java"
    else
            JAVA=`which java`
    fi

## 完整配置文件 ##

#!/bin/bash
    
    CONTROLLING STARTUP:
    
    This script relies on a few environment variables to determine startup
    behavior, those variables are:
    
    ES_PATH_CONF -- Path to config directory
    ES_JAVA_OPTS -- External Java Opts on top of the defaults set
    
    Optionally, exact memory values can be set using the `ES_JAVA_OPTS`. Note that
    the Xms and Xmx lines in the JVM options file must be commented out. Example
    values are "512m", and "10g".
    
    ES_JAVA_OPTS="-Xms8g -Xmx8g" ./bin/elasticsearch
    #配置自己的jdk1.8
    export JAVA_HOME=/home/hiekay/jdk1.8.0_181/
    export PATH=$JAVA_HOME/bin:$PATH
    
    source "`dirname "$0"`"/elasticsearch-env
    
    ES_JVM_OPTIONS="$ES_PATH_CONF"/jvm.options
    JVM_OPTIONS=`"$JAVA" -cp "$ES_CLASSPATH" org.elasticsearch.tools.launchers.JvmOptionsParser "$ES_JVM_OPTIONS"`
    ES_JAVA_OPTS="${JVM_OPTIONS//\$\{ES_TMPDIR\}/$ES_TMPDIR} $ES_JAVA_OPTS"
    
    #我添加的jdk判断
    if [ -x "$JAVA_HOME/bin/java" ]; then
            JAVA="/home/hiekay/jdk1.8.0_181/bin/java"
    else
            JAVA=`which java`
    fi
    
    cd "$ES_HOME"
    manual parsing to find out, if process should be detached
    if ! echo $* | grep -E '(^-d |-d$| -d |--daemonize$|--daemonize )' > /dev/null; then
      exec \
        "$JAVA" \
        $ES_JAVA_OPTS \
        -Des.path.home="$ES_HOME" \
        -Des.path.conf="$ES_PATH_CONF" \
        -Des.distribution.flavor="$ES_DISTRIBUTION_FLAVOR" \
        -Des.distribution.type="$ES_DISTRIBUTION_TYPE" \
        -cp "$ES_CLASSPATH" \
        org.elasticsearch.bootstrap.Elasticsearch \
        "$@"
    else
      exec \
        "$JAVA" \
        $ES_JAVA_OPTS \
        -Des.path.home="$ES_HOME" \
        -Des.path.conf="$ES_PATH_CONF" \
        -Des.distribution.flavor="$ES_DISTRIBUTION_FLAVOR" \
        -Des.distribution.type="$ES_DISTRIBUTION_TYPE" \
        -cp "$ES_CLASSPATH" \
        org.elasticsearch.bootstrap.Elasticsearch \
        "$@" \
        <&- &
      retval=$?
      pid=$!
      [ $retval -eq 0 ] || exit $retval
      if [ ! -z "$ES_STARTUP_SLEEP_TIME" ]; then
        sleep $ES_STARTUP_SLEEP_TIME
      fi
      if ! ps -p $pid > /dev/null ; then
        exit 1
      fi
      exit 0
    fi
    
    exit $?