【www.bbyears.com--php安装】
redhat 7 系列发布已经有一段时间了,最近抽时间看了下官方文档,对比了一些命令,对于其中比较关注的进行了记录,本篇主要是列出来了服务的管理改进,引进了systemctl管理和一个非常方便看cpu信息的命令lscpu
系统版本
[root@em12cdb ~]# uname -a Linux em12cdb 3.8.13-55.1.6.el7uek.x86_64 #2 SMP Wed Feb 11 14:18:22 PST 2015 x86_64 x86_64 x86_64 GNU/Linux [root@em12cdb ~]# more /etc/oracle-release Oracle Linux Server release 7.1
查看cpu信息
[root@em12cdb ~]# lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 2 On-line CPU(s) list: 0,1 Thread(s) per core: 1 Core(s) per socket: 2 Socket(s): 1 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 60 Model name: Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz Stepping: 3 CPU MHz: 3997.739 BogoMIPS: 7995.47 Hypervisor vendor: VMware Virtualization type: full L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 8192K NUMA node0 CPU(s): 0,1
systemctl命令管理服务和开机启动
以前主要是通过/etc/init.d/或者service命令管理服务,通过chkconfig管理是否开机启动
--查看某个服务状态
[root@em12cdb ~]# systemctl status crond.service crond.service - Command Scheduler Loaded: loaded (/usr/lib/systemd/system/crond.service; enabled) Active: active (running) since Mon 2015-07-27 11:59:16 CST; 1 months 7 days ago Main PID: 1245 (crond) CGroup: /system.slice/crond.service └�1245 /usr/sbin/crond -n Jul 27 11:59:16 em12cdb systemd[1]: Started Command Scheduler. Jul 27 11:59:16 em12cdb crond[1245]: (CRON) INFO (RANDOM_DELAY will be scaled with factor 33% if used.) Jul 27 11:59:17 em12cdb crond[1245]: (CRON) INFO (running with inotify support)
--停止某个服务
[root@em12cdb ~]# systemctl stop crond.service [root@em12cdb ~]# systemctl status crond.service crond.service - Command Scheduler Loaded: loaded (/usr/lib/systemd/system/crond.service; enabled) Active: inactive (dead) since Thu 2015-09-03 00:27:55 CST; 2s ago Main PID: 1245 (code=exited, status=0/SUCCESS) Jul 27 11:59:16 em12cdb systemd[1]: Started Command Scheduler. Jul 27 11:59:16 em12cdb crond[1245]: (CRON) INFO (RANDOM_DELAY will be scaled with factor 33% if used.) Jul 27 11:59:17 em12cdb crond[1245]: (CRON) INFO (running with inotify support) Sep 03 00:27:55 em12cdb systemd[1]: Stopping Command Scheduler... Sep 03 00:27:55 em12cdb systemd[1]: Stopped Command Scheduler. --启动某个服务 [root@em12cdb ~]# systemctl start crond.service [root@em12cdb ~]# systemctl status crond.service crond.service - Command Scheduler Loaded: loaded (/usr/lib/systemd/system/crond.service; enabled) Active: active (running) since Thu 2015-09-03 00:28:08 CST; 1s ago Main PID: 7294 (crond) CGroup: /system.slice/crond.service â””â”?7294 /usr/sbin/crond -n Sep 03 00:28:08 em12cdb systemd[1]: Started Command Scheduler. Sep 03 00:28:08 em12cdb crond[7294]: (CRON) INFO (RANDOM_DELAY will be scaled with factor 56% if used.) Sep 03 00:28:09 em12cdb crond[7294]: (CRON) INFO (running with inotify support) Sep 03 00:28:09 em12cdb crond[7294]: (CRON) INFO (@reboot jobs will be run at computer's startup.) --重启某个服务 [root@em12cdb ~]# systemctl restart crond.service [root@em12cdb ~]# systemctl status crond.service crond.service - Command Scheduler Loaded: loaded (/usr/lib/systemd/system/crond.service; enabled) Active: active (running) since Thu 2015-09-03 00:28:24 CST; 2s ago Main PID: 7323 (crond) CGroup: /system.slice/crond.service â””â”?7323 /usr/sbin/crond -n Sep 03 00:28:24 em12cdb systemd[1]: Starting Command Scheduler... Sep 03 00:28:24 em12cdb systemd[1]: Started Command Scheduler. Sep 03 00:28:24 em12cdb crond[7323]: (CRON) INFO (RANDOM_DELAY will be scaled with factor 61% if used.) Sep 03 00:28:24 em12cdb crond[7323]: (CRON) INFO (running with inotify support) Sep 03 00:28:24 em12cdb crond[7323]: (CRON) INFO (@reboot jobs will be run at computer's startup.) --检查某个服务是否开机启动 [root@em12cdb ~]# systemctl is-enabled crond.service enabled --禁止某个服务开机启动 [root@em12cdb ~]# systemctl disable crond.service rm '/etc/systemd/system/multi-user.target.wants/crond.service' [root@em12cdb ~]# systemctl is-enabled crond.service disabled --查看所有服务开机启动情况(这里使用了grep便于说明) [root@em12cdb ~]# systemctl list-unit-files --type service|grep cron crond.service disabled [root@em12cdb ~]# systemctl enable crond.service ln -s '/usr/lib/systemd/system/crond.service' '/etc/systemd/system/multi-user.target.wants/crond.service' [root@em12cdb ~]# systemctl list-unit-files --type service|grep cron crond.service enabled
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systemctl命令修改启动模式
以前版本中,直接通过vi修改/etc/inittab文件
--多用户图形界面 [root@em12cdb ~]# systemctl get-default graphical.target --多用户字符界面 [root@em12cdb ~]# systemctl set-default multi-user.target rm '/etc/systemd/system/default.target' ln -s '/usr/lib/systemd/system/multi-user.target' '/etc/systemd/system/default.target' [root@em12cdb ~]# systemctl get-default multi-user.target systemd runlevel
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