[root@linuxidc limits.d]# cat /sys/kernel/mm/transparent_hugepage/enabled
[always] madvise never
[root@linuxidc limits.d]# cat /sys/kernel/mm/transparent_hugepage/defrag
[always] madvise never
[root@linuxidc limits.d]#
[root@linuxidc limits.d]# echo "never" > /sys/kernel/mm/transparent_hugepage/enabled
[root@linuxidc limits.d]# echo "never" > /sys/kernel/mm/transparent_hugepage/defrag
[root@linuxidc limits.d]#
[root@linuxidc limits.d]# cat /sys/kernel/mm/transparent_hugepage/enabled
always madvise [never]
[root@linuxidc limits.d]# cat /sys/kernel/mm/transparent_hugepage/defrag
always madvise [never]
[root@linuxidc limits.d]#
[root@linuxidc limits.d]#
8 创建mongodb实例管理脚本
为了方便对mongodb实例的启动和停止，可以先创建mongodb的启动脚本，停止脚本，然后在 /etc/init.d/ 目录下创建一个服务脚本，这样就可以用 service 进行实例管理了。
脚本1：启动脚本：
vim /home/mongodb/scripts/mongodb_start.sh
#!/bin/sh
# the scripts is used to start mongodb instance with port 27117.
# created by zhaofx on 20161019.
echo -n "Starting MongoDB port 27117 ... "
/usr/local/mongodb/bin/mongod --config /etc/mongodb/mongo_27117.conf &
脚本二：停止脚本：
vim /home/mongodb/scripts/mongodb_stop.sh
#!/bin/bash
# the scripts is used to stop mongodb instance with port 27117.
# created by zhaofx on 20161019.
echo -n "Stopping MongoDB port 27117"
pid=`ps -o pid,command ax | grep mongod | awk '!/awk/ && !/grep/ {print $1}'`;
if [ "${pid}" != "" ]; then
kill -2 ${pid};
fi
脚本三：服务脚本：
vim /etc/init.d/mongodb
#! /bin/sh
# the scripts is used to mange mongodb service with linux service type.
# created by zhaofx on 20161019.
PATH=/usr/local/mongodb/bin:/sbin:/bin:/usr/sbin:/usr/bin
NAME=mongodb
start(){
/home/mongodb/scripts/mongodb_start.sh
}
stop(){
/home/mongodb/scripts/mongodb_stop.sh
}
test -x $DAEMON || exit 0
set -e
case "$1" in
start)
start
;;
stop)
stop
;;
*)
N=/etc/init.d/$NAME
echo "Usage: $N {start|stop}" >&2
exit 1
;;
esac
exit 0
修改脚本的属组，添加执行权限：
chown -R mongodb:mongodb /home/mongodb/scripts/
chown mongodb:mongodb /etc/init.d/mongodb
chmod +x /home/mongodb/scripts/mongodb_start.sh
chmod +x /home/mongodb/scripts/mongodb_stop.sh
chmod +x /etc/init.d/mongodb
最后执行服务启动和停止mongodb实例的过程为：