很多用戶表示,Linux系統下的一些Java項目總是會無緣無故的消失,Linux系統下的Java進程不見了怎麼辦呢?今天學習啦小編就和大家說說Linux系統下的Java進程不見了的解決方法。
Linux系統下的Java進程不見了解決方法
1.磁盤滿了，這個問題比較簡單，只要清理一下磁盤就可以了。
2.tomcat在關閉的或是重啟的時候，常常後台進程沒有被關閉。需要用ps aux|grep java 這個命令查一下，把多余的進程關掉，再啟動startup.sh
3.這種情況比較少見，就是在系統資源缺少的情況下，被系統自動DOWN掉，或是被其它軟件干掉了。
其實在我這裡，這樣還是沒有解決，進程還是莫名其妙會自己掛掉，日志也沒有任何報錯。後來打開tomcat主目錄下的子目錄conf裡面的tomcat-users.xml文件，用戶配置內容如下：
全都關閉掉。
linux下啟動java程序的通用腳本介紹
一、start.sh
#!/bin/bash
cd `dirname $0`
BIN_DIR=`pwd`
cd ..
DEPLOY_DIR=`pwd`
CONF_DIR=$DEPLOY_DIR/conf
SERVER_NAME=`sed '/server.name/!d;s/.*=//' conf/server.properties | tr -d '\r'`
SERVER_PORT=`sed '/server.netty.port/!d;s/.*=//' conf/server.properties | tr -d '\r'`
if [ -z "$SERVER_NAME" ]; then
SERVER_NAME=`hostname`
fi
PIDS=`ps --no-heading -C java -f --width 1000 | grep "$CONF_DIR" |awk '{print $2}'`
if [ -n "$PIDS" ]; then
echo "ERROR: The $SERVER_NAME already started!"
echo "PID: $PIDS"
exit 1
fi
if [ -n "$SERVER_PORT" ]; then
SERVER_PORT_COUNT=`netstat -tln | grep $SERVER_PORT | wc -l`
if [ $SERVER_PORT_COUNT -gt 0 ]; then
echo "ERROR: The $SERVER_NAME port $SERVER_PORT already used!"
exit 1
fi
fi
LOGS_DIR=""
LOGS_DIR=$DEPLOY_DIR/logs
#if [ ! -d $LOGS_DIR ]; then
# mkdir $LOGS_DIR
#fi
STDOUT_FILE=$LOGS_DIR/stdout.log
LIB_DIR=$DEPLOY_DIR/lib
LIB_JARS=`find $LIB_DIR|grep .jar|awk '{print $0}'|tr "\n" ":"`
JAVA_OPTS=" -Djava.awt.headless=true -Djava.net.preferIPv4Stack=true "
JAVA_DEBUG_OPTS=""
if [ "$1" = "debug" ]; then
JAVA_DEBUG_OPTS=" -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n "
fi
JAVA_JMX_OPTS=""
if [ "$1" = "jmx" ]; then
JAVA_JMX_OPTS=" -Dcom.sun.management.jmxremote.port=1099 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false "
fi
JAVA_MEM_OPTS=""
BITS=`file $JAVA_HOME/bin/java | grep 64-bit`
if [ -n "$BITS" ]; then
let memTotal=`cat /proc/meminfo |grep MemTotal|awk '{printf "%d", $2/1024 }'`
if [ $memTotal -gt 2500 ];then
JAVA_MEM_OPTS=" -server -Xmx1024m -Xms1024m -Xmn400m -XX:PermSize=128m -Xss256k -XX:+DisableExplicitGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:+UseCMSCompactAtFullCollection -XX:LargePageSizeInBytes=128m -XX:+UseFastAccessorMethods -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=70 "
else
JAVA_MEM_OPTS=" -server -Xmx1024m -Xms1024m -Xmn400m -XX:PermSize=128m -Xss256k -XX:+DisableExplicitGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:+UseCMSCompactAtFullCollection -XX:LargePageSizeInBytes=128m -XX:+UseFastAccessorMethods -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=70 "
fi
else
JAVA_MEM_OPTS=" -server -Xmx1024m -Xms1024m -XX:PermSize=128m -XX:SurvivorRatio=2 -XX:+UseParallelGC "
fi
echo -e "Starting the $SERVER_NAME ...\c"
nohup java $JAVA_OPTS $JAVA_MEM_OPTS $JAVA_DEBUG_OPTS $JAVA_JMX_OPTS -classpath $CONF_DIR:$LIB_JARS com.hzins.framework.server.ServerMain > $STDOUT_FILE 2>&1 &
COUNT=0
while [ $COUNT -lt 1 ]; do
echo -e ".\c"
sleep 1
# if [ -n "$SERVER_PORT" ]; then
# COUNT=`echo status | nc 127.0.0.1 $SERVER_PORT -i 1 | grep -c OK`
# else
COUNT=`ps --no-heading -C java -f --width 1000 | grep "$DEPLOY_DIR" | awk '{print $2}' | wc -l`
# fi
if [ $COUNT -gt 0 ]; then
break
fi
done
echo "OK!"
PIDS=`ps --no-heading -C java -f --width 1000 | grep "$DEPLOY_DIR" | awk '{print $2}'`
echo "PID: $PIDS"
#echo "STDOUT: $STDOUT_FILE"
二、stop.sh
#!/bin/bash
cd `dirname $0`
BIN_DIR=`pwd`
cd ..
DEPLOY_DIR=`pwd`
CONF_DIR=$DEPLOY_DIR/conf
SERVER_NAME=`sed '/server.name/!d;s/.*=//' conf/server.properties | tr -d '\r'`
if [ -z "$SERVER_NAME" ]; then
SERVER_NAME=`hostname`
fi
PIDS=`ps --no-heading -C java -f --width 1000 | grep "$CONF_DIR" |awk '{print $2}'`
if [ -z "$PIDS" ]; then
echo "ERROR: The $SERVER_NAME does not started!"
exit 1
fi
if [ "$1" != "skip" ]; then
$BIN_DIR/dump.sh
fi
echo -e "Stopping the $SERVER_NAME ...\c"
for PID in $PIDS ; do
kill $PID > /dev/null 2>&1
done
COUNT=0
while [ $COUNT -lt 1 ]; do
echo -e ".\c"
sleep 1
COUNT=1
for PID in $PIDS ; do
PID_EXIST=`ps --no-heading -p $PID`
if [ -n "$PID_EXIST" ]; then
COUNT=0
break
fi
done
done
echo "OK!"
echo "PID: $PIDS"
三、restart.sh
#!/bin/bash
cd `dirname $0`
./stop.sh
./start.sh