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Author Archives: admin

Last logged in users

Posted on July 19, 2017 by admin

last is a command used to list last logged in users on a linux system. [root@m3722 ~]# last root pts/0 112.133.248.3 Wed Jul 19 21:55 still logged in root pts/0 112.133.248.3 Tue Jul 18 19:58 – 20:00 (00:01) root pts/0

CentOS 7 rc.local not working

Posted on July 18, 2017 by admin

To get /etc/rc.local working on CentOS 7, first you need to set it executable. Now enable rc-local service with command Now start service. Verify it is running properly

Server Load – Disk I/O

Posted on July 17, 2017 by admin

Here are some commands to monitor and identify Disk I/O related server loads. iostat iostat give stats about disk i/o usage. Some of the important values are * %iowait = if this value is higher, your server is waiting on

Server Load

Posted on July 17, 2017 by admin

When your server is under load, you need to identify the bottleneck. This can be CPU, Memory or Disk IO. Here are some of the useful commands that help you identify cause of high server load. uptime uptime is the

Adding IP address on RHEL/CentOS 7 server with nmtui

Posted on July 17, 2017 by admin

nmtui (Network Manager Text user interface) is a command line program available in RHEL/CentOS 7 to configure IP address. This is a text based UI, allow you to add IP address to network interfaces. To install nmtui, run To navigate

AH01215: Can’t locate CGI.pm in @INC

Posted on July 17, 2017 by admin

On a web site using xpanel control panel (free hosting script created with perl), i get error This is because perl-CGI module was missing on the server. On CentOS 7 server, you can install it with command

Accounting

Posted on July 17, 2017 by admin

Free Accounting software https://www.manager.io/ https://www.waveapps.com/

configure: error: libmysqlclient is needed for MySQL support

Posted on July 16, 2017 by admin

When i install pureftpd with mysql support on CentOS 7 server, i get following error This is because MySql dev packages are missing on the server. Fixed by installing

Find SSL certificate details with OpenSSL

Posted on July 16, 2017 by admin

Encrypt files using OpenSSL Generate random string using OpenSSL Generate Self Signed SSL If you have .crt file, you can find more details about the certificate with command To get details of SSL installed on a web site, use csr

CentOS 7 Invalid command SSLEngine

Posted on July 16, 2017 by admin

On CentOS 7 server, after adding SSL virtualhost entry, i got error Jul 16 10:27:56 mon1 httpd[6620]: AH00526: Syntax error on line 359 of /etc/httpd/conf/httpd.conf: Jul 16 10:27:56 mon1 httpd[6620]: Invalid command ‘SSLEngine’, perhaps misspelled or defined by a module