最近公司專案的Dev環境要自己維護，為了避免麻煩，寫了一個釋出指令碼，但是發現每次關閉和伺服器的SSH連線後，Tomcat就意外退出，檢視日誌發現最後退出有如下幾行日誌：

Nov 10, 2017 2:38:35 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["http-nio-8080"]

Nov 10, 2017 2:38:35 PM org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service Catalina

[INFO][2017
 
-11-10 14:38:35] org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:960) Closing WebApplicationContext for namespace 'Dispatcher-servlet': startup date [Fri Nov 10 14:37:53 CST 2017]; parent: Root WebApplicationContext
    [INFO][2017-11-10 14:38:35] org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:960
 
) Closing Root WebApplicationContext: startup date [Fri Nov 10 14:37:52 CST 2017]; root of context hierarchy
    Nov 10, 2017 2:38:35 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/] appears to have started a thread named [FileWatchdog] but has failed to
 
 stop it. This is very likely to create a memory leak.
Nov 10, 2017 2:38:35 PM org.apache.coyote.AbstractProtocol stop
INFO: Stopping ProtocolHandler ["http-nio-8080"]
Nov 10, 2017 2:38:35 PM org.apache.coyote.AbstractProtocol destroy
INFO: Destroying ProtocolHandler ["http-nio-8080"]

最開始懷疑是 OOM 問題，排查程式碼沒有發現相關問題，JVM配置OOM後轉存堆記憶體快照，也沒有發現問題，後來發現規律是每次關閉SSH連線一會兒後Tomcat即關閉，度娘後發現如下文章：

-XX:+HeapDumpOnOutOfMemoryError  -XX:HeapDumpPath=\data\heap\

解決方案

在指令碼開始新增 set -m，使用監視模式。

問題原因

• SSH關閉後，作業系統kill掉指令碼；
• Java程序掛在了指令碼程序下面；

修改後的指令碼

修改後的釋出指令碼：

#!/bin/sh
# author qiesai

##呼叫格式：base-war-deploy-tools.sh proName branchName profile 
##命名規則：proName作為back、release、war的名稱存在，要保持一致
PRO_NAME=$1
BRANCH_NAME=$2
PROFILE=$3

BASE_DIR=`pwd`
CODE_DIR="/data/code/${PRO_NAME}/"
RELEASE_DIR="/data/release/"
BACKUP_DIR="/data/backup/"
WAR_NAME="${PRO_NAME}.war";


function stopTomcat(){
    echo "_______________________________"
    echo "stop tomcat"

    TOMCAT_PID=`ps -ef|grep tomcat | grep -v 'grep\|tail' | awk '{print $2}'`
    if [ -n "$TOMCAT_PID" ]; then
        echo "tomcat is running : ${TOMCAT_PID} , will stop it"
        kill -9 $TOMCAT_PID
    fi

    COUNT=0  
    while [ $COUNT -lt 1 ]; do      
        echo -e ".\c"  
        sleep 1
        COUNT=1

        PID_EXIST=`ps --no-heading -p $TOMCAT_PID`  
        if [ -n "$PID_EXIST" ]; then  
            COUNT=0
            break
        fi 
    done
    echo ""
    echo "stop tomcat succes"
}

function buildProject(){
    source /etc/profile
    echo "_______________________________"
    echo "pull git code"
    cd $CODE_DIR
    git branch -q $BRANCH_NAME
    git checkout $BRANCH_NAME
    git pull origin $BRANCH_NAME
    echo "_______________________________"
    echo "buil project"
    echo `/data/maven/maven/bin/mvn clean package -P${PROFILE}`
    echo "buil finish"
}

function releaseWar(){
    echo "_______________________________"
    echo "deploy war"
    cd $RELEASE_DIR
    mv -f ./$WAR_NAME $BACKUP_DIR$WAR_NAME
    #注意不要 rm -rf /*也不要 cd到/下
    rm -rf *
    mv -f $CODE_DIR/target/$WAR_NAME ./$WAR_NAME 
    #set -m是解決Tomcat關閉的關鍵點。
    set -m
    nohup /data/tomcat/bin/startup.sh &
    echo "deploy success"
}

function main(){
    if [ -z "$PRO_NAME" ]; then
        echo "please input project name"
        exit;
    fi

    if [ -z "$BRANCH_NAME" ]; then
        echo "please input a git branch name"
        exit;
    fi

    if [ -z "$PROFILE" ]; then
        echo "please choose a profile"
        exit;
    fi

    echo "=====================begin deploy====================="
    buildProject;
    stopTomcat;
    releaseWar;
    echo "=====================deploy succ====================="
    tail -f /data/tomcat/logs/catalina.out
}

main;