Linux System Services

NTSYSV Service Configuration Tool

Yum Install-y Ntsysv

Used to configure which services are turned on or off, somewhat like a graphical interface, but controlled using a keyboard. If you do not have this command, install it using Yum Install- y ntsysv . After installation, directly run the command NTSYSV Enter after a configuration interface:

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Press the top and bottom of the keyboard to adjust the red cursor, press the space can be selected to open or do not open, if the preceding brackets display a * is open otherwise does not open. This tool also allows you to see all the services in the current system. It is recommended to stop all other services except "Crond, Iptables, Network, sshd, Syslog, Irqbalance, SendMail, Microcode_ctl". When selected, press the TAB key to select OK, then enter to restart the machine to take effect.

2. Chkconfig Service Management Tools

[[email protected] ~]# ls /etc/init.d/abrt-ccpp          cpuspeed      ip6tables     mdmonitor    postfix      sandboxabrtd              crond         iptables       messagebus  psacctsaslauthdabrt-oops          functions     irqbalance    netconsole   quota_nld    singleacpid              haldaemon     kdump          netfs       rdisc         smartdatd               halt           killall       network      restorecond  sshdauditd             htcacheclean  lvm2-lvmetad  ntpd         rngd         sysstatblk-availability  httpd          lvm2-monitor  ntpdate      Rsyslog      udev-post

service   service name  start|stop|restart   The service name here is/etc/init.d/ These files in the directory. In addition to using  service  crond  start   Start Crond, you can also use / Etc/init.d/crond  start   to start.

chkconfig  -- List   lists all services and whether each level is turned on:

[[email protected] ~]# chkconfig --listabrt-ccpp        0: Off   1: Off   2: Off   3: Off   4: Off   5: Enable   6: Off ABRTD            0: Off   1: Off   2: Off    3: Off   4: Turn off   5: Enable   6: Turn off acpid            0: Off   1: Off   2: Enable   3: Turn off   4: Enable   5: Enable   6: Close atd             0: Close    1: Off   2: Off   3: Off   4: Enable   5: Enable   6: Turn off auditd           0: Off   1: Turn off   2: Enable   3: Off    4: Enable   5: Enable   6: Off blk-availability        0: Off   1: Enable   2: Enable &Nbsp; 3: Turn off   4: Enable   5: Enable   6: Turn off cpuspeed         0: Turn off   1: Enable   2: Enable   3: Turn off   4: Enable   5: Enable   6: Close crond           0: Turn off   1: Turn off   2: Enable   3: Enable   4: Enable   5: Enable   6: Turn off haldaemon        0: Off   1: Off   2: Off   3: Off   4: Enable   5: Enable   6: Close htcacheclean    0: Off   1: Off   2: Off   3: Off   4: Off   5: Off   6: Off httpd           0: Off   1: Close   2: Close   3: Close   4: Close   5: Close   6: Close Ip6tables        0: Off   1: Turn off   2: Enable   3: Turn off   4: Enable   5: Enable   6: Off IPtables        0: Off   1: Turn off   2: Enable   3: Enable   4: Enable   5: Enable   6: Turn off irqbalance      0: Off    1: Off   2: Turn off   3: Enable   4: Enable   5: Enable   6: Turn off kdump            0: Off   1: Off   2: Off   3: Off    4: Enable   5: Enable   6: Turn off lvm2-monitor    0: Turn off   1: Enable    2: Enable   3: Turn off   4: Enable   5: Enable   6: Turn off mdmonitor        0: Off   1: Turn off   2: Enable   3: Turn off   4: Enable   5: Enable   6: Close messagebus      0: Close   1: Turn off   2: Enable   3: Off    4: Enable   5: Enable   6: Off netconsole      0: Off   1: Off   2: Close   3: Off   4: Off   5: Off   6: Off netfs            0: Off   1: Off   2: Off   3: Off   4: Enable   5: Enable   6: Close network         0: Close   1: Turn off   2: Enable    3: Enable   4: Enable   5: Enable   6: Turn off ntpd             0: Off   1: Off   2: Off   3: Off   4: Off   5: Off   6: Off ntpdate         0: Off   1: Off   2 : Off   3: Off   4: Off   5: Off   6: Off postfix          0: Off   1: Off   2: Enable   3: Turn off   4: Enable   5: Enable    6: Close psacct          0: Close   1: Turn off   2: Close   3: Close &Nbsp; 4: Off   5: Off   6: Off quota_nld       0: Off    1: Close   2: Close   3: Close   4: Close   5: Close   6: Close rdisc            0: Off   1: Off   2: Off   3: Off   4: Off   5: Off   6: Off restorecond     0: Off   1: Off   2: Close   3: Close   4: Close   5: Close   6: Close rngd             0: Off   1: Off   2: Off   3: Off    4: Off   5: Off   6: Off rsyslog         0: Off   1: Turn off   2: Enable   3: Turn off   4: Enable   5: Enable   6: Turn off SASLAUTHD        0: Off   1: Off   2: Off   3: Off   4: Off   5: Close   6: Close SMArtd          0: Off   1: Off   2: Off    3: Off   4: Off   5: Off   6: Off sshd             0: Off   1: Turn off   2: Enable   3: Enable   4: Enable   5: Enable   6: Off sysstat         0: Turn off   1: Enable   2 : Enable   3: Enable   4: Enable   5: Enable   6: Turn off udev-post        0: Turn off   1: Enable   2: Enable   3: Turn off   4: Enable   5: Enable   6: Shut down

The level here (0,1,2,3,4,5,6) is the number of/etc/inittab inside the boot level, 0, 1, 6 the operating level is reserved by the system: 0 as Shutdown action, 1 as a reboot to single-user mode, 6 restart; In the general Linux system implementation, are used in 2, 3, 4, 5 levels, in the CentOS system, 2 represents a multiuser mode without NFS support, 3 represents a full multiuser mode (also the most commonly used level), 4 is reserved for user customization, and 5 represents the graphical login method. We can use the grep command to filter out the services we want to see:

[[email protected] ~]# chkconfig--list |grep croncrond 0: Off 1: Off 2: Enable 3: Enable 4: Enable 5: Enable 6: Off

Now that we've just seen whether the services are on at each level, how do you change which level is turned on?

[[email protected] ~]# chkconfig--level 3 crond off[[email protected] ~]# chkconfig--list |grep croncrond 0: Off 1: Off 2: Enable 3: Off 4: Enable 5: Enable 6: Off

Specify the level with --level , followed by the service name, then off or on,'--level can also be followed by multiple levels:

[[email protected] ~]# chkconfig--level 345 crond off[[email protected] ~]# chkconfig--list |grep croncrond 0: Off 1: Off 2: Enabled 3: Off 4: off 5: off 6: Off

You can also omit the level, which is the default for 2,3,4,5 level operations:

[[email protected] ~]# chkconfig crond on[[email protected] ~]# chkconfig--list |grep croncrond 0: Off 1: off 2: Kai With 3: Enable 4: Enable 5: Enable 6: Off

service   service name  start   In this form, and can be  chkconfig  --list   found in. Of course it can be deleted.

[[email protected] ~]# chkconfig--del crond[[email protected] ~]# chkconfig--list |grep cron[[email protected] ~]# CHKCO Nfig--add crond[[email protected] ~]# chkconfig--list |grep croncrond 0: Off 1: Off 2: Enable 3: Enable 4: Enable 5: Enable 6: Off

This feature is commonly used to add custom startup scripts to system services. About the system services to say these things, in fact, there are a lot of content Amin not introduced, the reason is very simple, a lot of you can not digest and more than you can not use.

This article is from "Linux rookie" blog, please be sure to keep this source http://490617581.blog.51cto.com/11186315/1757835

Linux System Services