centos7

This is a quick note to list failed services on systemd system. [root@zilla ~]# systemctl status ● zilla State: degraded Jobs: 0 queued Failed: 1 units Since: Fri 2020-09-04 02:20:47 AEST; 3 months 11 days ago CGroup: / ├─1 /usr/lib/systemd/systemd --system --deserialize 22 └─system.slice ├─httpd.service │ ├─21860 /usr/sbin/httpd -DFOREGROUND │ ├─21861 /usr/sbin/httpd -DFOREGROUND │ ├─21862 /usr/sbin/httpd -DFOREGROUND │ ├─21863 /usr/sbin/httpd -DFOREGROUND │ ├─21864 /usr/sbin/httpd -DFOREGROUND │ └─21865 /usr/sbin/httpd -DFOREGROUND ... [root@zilla ~]# systemctl list-units --failed UNIT LOAD ACTIVE SUB DESCRIPTION ● ipmi....

Tonight I started to review the learning material for Red Hat System Administration III to prepare for RHCSE exam. I need a machine with GUI, and all my CentOS 7 VMs are headless. So let’s install the GUI on it, shall I? First install epel repo, if it’s not yet installed: Then install the 2 groups: Tip, if “I” can’t remember the names of the groups, I can run this command to list all available groups:...

I have a server running CentOS 6 successfully upgraded to CentOS 7. The only problem I encountered so far is that ‘grep’ doesn’t work. First thing I tried was to reinstall pcre package which provides libpcre.so*. It still didn’t work. Fortunately, someone has posted a solution as the following: Credit: update to Centos 7; libpcre.so.0 No such file or directory