centos7 自启动脚本
Linux 运行等级。
运行级别
运行级别 定义了在 Linux 系统的目前状态（或运行级别）下能够完成哪些任务。每个 Linux 系统支持三种基本的运行级别，以及完成正常操作所需的一个或多个运行级别。基本的运行级别如 表 1 中所示。
表 1. Linux 的基本运行级别
级别 目的
0 关闭（或停止）系统
1 单用户模式；通常别称为 s 或 S
6 重启系统
除了这些基本的级别之外，运行级别使用还因版本不同而有所不同。一种常见的使用设置如 表 2 所示。
表 2. 其他常见的 Linux 运行级别
级别 目的
2 没有联网的多用户模式
3 联网的多用户模式
5 联网并且使用 X Window 系统的多用户模式
Slackware 发布版本对运行了 X Window 系统的整个系统使用了运行级别 4 而非 5。Debian 及其派生物，比如 Ubuntu，对所有的多用户模式使用了单一运行级别，通常为运行级别 2。请务必参考适用于您的发布版本的文档。
Linux Centos Automatically Start Apache Tomcat server on boot This article assumes that you have already installed the Apache Tomcat Server on your Linux Centos machine. If you need help with your with Apache Tomcat Setup then please click on the Link below. Install Apache Tomcat Server on Linux Centos
Step 1: Create a file named tomcat6 in your /etc/init.d directory $ cd /etc/init.d $ gedit tomcat6
Step 2: Copy the following script and save the file
!/bin/bash
chkconfig: 2345 80 20
Description: Tomcat Server basic start/shutdown script
/etc/init.d/tomcat6 -- startup script for the Tomcat 6 servlet engine
TOMCAT_HOME=/usr/local/apache-tomcat-6.0.35/bin START_TOMCAT=/usr/local/apache-tomcat-6.0.35/bin/startup.sh STOP_TOMCAT=/usr/local/apache-tomcat-6.0.35/bin/shutdown.sh
start() { echo -n "Starting tomcat6: " cd $TOMCAT_HOME ${START_TOMCAT} echo "done." }
stop() { echo -n "Shutting down tomcat6: " cd $TOMCAT_HOME ${STOP_TOMCAT} echo "done." }
case "$1" in
start) start ;;
stop) stop ;;
restart) stop sleep 10 start ;;
*) echo "Usage: $0 {start|stop|restart}"
esac exit 0
Change the settings for the chkconfig based on your requirements. In a scenario where Apache Web server is in the front of Tomcat server with MySQL database usually the startup sequence should be MySQL then Tomcat and Apache Web Server in last. Also make sure you change the TOMCAT_HOME, START_TOMCAT and STOP_TOMCAT variables based on your Tomcat Install.
Step 3: Update the file permissions to make it executable by any user $ chmod 755 tomcat6
Step 4: Make sure you have chkconfig command installed $ chkconfig --helpotherwise just install it $ sudo apt-get install chkconfig
Step 5: Run chkconfig command to add the script to the startup services $ chkconfig --add tomcat6
Basically the chkconfig command automatically adds the symbolic links for starting and stopping the service based on the paramaters passed to it. Here is the list of links created from the above link. You can run the find command to check. $ find . -name "*tomcat6"
Response from the above command ...（没有出现） ./rc.d/init.d/tomcat6 ./rc.d/rc4.d/S80tomcat6 ./rc.d/rc3.d/S80tomcat6 ./rc.d/rc6.d/K20tomcat6 ./rc.d/rc5.d/S80tomcat6 ./rc.d/rc2.d/S80tomcat6 ./rc.d/rc0.d/K20tomcat6 ./rc.d/rc1.d/K20tomcat6
Step 6: Make sure scripts got added to the startup services Type the following command on the Terminal $ chkconfig --list tomcat6 Response should be something like this tomcat6 0:off 1:off 2:on 3:on 4:on 5:on 6:off
Step 7: Verify your service is working To start the Tomcat server $ service tomcat start To stop the Tomcat server $ service tomcat stop
手写了２个shell :* tomcat7_configurationb.sh
!/bin/bash
chmod 755 /etc/init.d/tomcat6 chkconfig --add tomcat6 chkconfig --list tomcat6
del_tomcat7Configuration.sh
!/bin/bash
chkconfig --del tomcat6
概念 CHKCONFIG ->updates and queries runlevel information for system ser- vices chkconfig
CHKCONFIG(8) CHKCONFIG(8)
NAME
chkconfig - updates and queries runlevel information for system ser-
vices
SYNOPSIS
chkconfig --list [name]
chkconfig --add name
chkconfig --del name
chkconfig [--level levels] name <on|off|reset>
chkconfig [--level levels] name
DESCRIPTION
chkconfig provides a simple command-line tool for maintaining the
/etc/rc[0-6].d directory hierarchy by relieving system administrators
of the task of directly manipulating the numerous symbolic links in
those directories.
This implementation of chkconfig was inspired by the chkconfig command
present in the IRIX operating system. Rather than maintaining configu-
ration information outside of the /etc/rc[0-6].d hierarchy, however,
this version directly manages the symlinks in /etc/rc[0-6].d. This
leaves all of the configuration information regarding what services
init starts in a single location.
chkconfig has five distinct functions: adding new services for manage-
ment, removing services from management, listing the current startup
information for services, changing the startup information for ser-
vices, and checking the startup state of a particular service.
When chkconfig is run without any options, it displays usage informa-
tion. If only a service name is given, it checks to see if the service
is configured to be started in the current runlevel. If it is, chkcon-
fig returns true; otherwise it returns false. The --level option may be
used to have chkconfig query an alternative runlevel rather than the
current one.
If one of on, off, or reset is specified after the service name, chk-
config changes the startup information for the specified service. The
on and off flags cause the service to be started or stopped, respec-
tively, in the runlevels being changed. The reset flag resets the
startup information for the service to whatever is specified in the
init script in question.
By default, the on and off options affect only runlevels 2, 3, 4, and
5, while reset affects all of the runlevels. The --level option may be
used to specify which runlevels are affected.
Note that for every service, each runlevel has either a start script or
a stop script. When switching runlevels, init will not re-start an
already-started service, and will not re-stop a service that is not
running.
chkconfig also can manage xinetd scripts via the means of xinetd.d con-
figuration files. Note that only the on, off, and --list commands are
supported for xinetd.d services.
OPTIONS
--level levels
Specifies the run levels an operation should pertain to. It is
given as a string of numbers from 0 to 7. For example, --level
35 specifies runlevels 3 and 5.
--add name
This option adds a new service for management by chkconfig.
When a new service is added, chkconfig ensures that the service
has either a start or a kill entry in every runlevel. If any
runlevel is missing such an entry, chkconfig creates the appro-
priate entry as specified by the default values in the init
script. Note that default entries in LSB-delimited ’INIT INFO’
sections take precedence over the default runlevels in the
initscript.
--del name
The service is removed from chkconfig management, and any sym-
bolic links in /etc/rc[0-6].d which pertain to it are removed.
Note that future package installs for this service may run chk-
config --add, which will re-add such links. To disable a ser-
vice, run chkconfig name off.
--list name
This option lists all of the services which chkconfig knows
about, and whether they are stopped or started in each runlevel.
If name is specified, information in only display about service
name.
RUNLEVEL FILES
Each service which should be manageable by chkconfig needs two or more
commented lines added to its init.d script. The first line tells chk-
config what runlevels the service should be started in by default, as
well as the start and stop priority levels. If the service should not,
by default, be started in any runlevels, a - should be used in place of
the runlevels list. The second line contains a description for the
service, and may be extended across multiple lines with backslash con-
tinuation.
For example, random.init has these three lines:
# chkconfig: 2345 20 80
# description: Saves and restores system entropy pool for \
# higher quality random number generation.
This says that the random script should be started in levels 2, 3, 4,
and 5, that its start priority should be 20, and that its stop priority
should be 80. You should be able to figure out what the description
says; the \ causes the line to be continued. The extra space in front
of the line is ignored.
SEE ALSO
init(8) ntsysv(8) system-config-services(8)
AUTHOR
Erik Troan <[email protected]>