DevBlog.co » Programming

Problem Sending Emails using PHP mail

Frank Perez — Fri, 31 May 2013 18:20:41 +0000

If you are having issues sending out emails using the standard PHP mail you need to make sure that you have sendmail installed and running on the server. To install sendmail do the following: yum install sendmail Then you’ll want to make sure to start the new services: service sendmail start Lastly, you’ll want to make sure that sendmail starts automatically after a reboot. chkconfig sendmail on If you are still having issues after following the above

Parallels Plesk ProFTP not allowing FTP users to connect

Frank Perez — Fri, 31 May 2013 16:27:53 +0000

If you have a server with Parallels Plesk, odds are that is using ProFTP for its FTP server which is started with xinetd. I was getting an error trying to connect to the server via FTP and figured I would share the solution. First when I tried connecting to the FTP server using lftp, I found that it would get into a loop of trying to reconnect. To fix this issue I ran lftp in debug mode.

How To Disable Health Monitoring Notifications from Parallels Plesk

Frank Perez — Fri, 31 May 2013 14:46:02 +0000

In order to disable the “alarm level changed” email notifications which are associated with the Health Monitoring module in Parallels Plesk, you need to disable the service from running and starting with your server. First you will need to login as root into your Linux server. In order to stop the service from running run the following command. /etc/init.d/psa-health-monitor-notificationd stop If you would like to stop the service from starting up automatically you can disable it using

RHCSA Certification Study Guide

Frank Perez — Wed, 20 Jun 2012 00:37:08 +0000

This page is currently under development. I will be updating each section by supplying a link to examples and how to do each of the following points. Understand and Use Essential Tools Access a shell prompt and issue commands with correct syntax Use input-output redirection (>, >>, |, 2>, etc.) Use grep and regular expressions to analyze text Access remote systems using ssh and VNC Log in and switch users in multi-user runlevels Archive, compress, unpack and

Start, stop, and check the status of network services.

Frank Perez — Wed, 20 Jun 2012 00:36:33 +0000

In order to start, stop, or even check the status of any service you would use the utility service.

Start and stop virtual machines.

Frank Perez — Wed, 20 Jun 2012 00:26:20 +0000

In order to stop or start virtual machines you can use either the virsh command or the virt-manager utility.

Access a virtual machine’s console.

Frank Perez — Wed, 20 Jun 2012 00:09:31 +0000

You can access a virtual machines console in a variety of ways. You could use either virsh, virt-manager, virt-viewer, or even ssh.

Locate and interpret system log files.

Frank Perez — Tue, 19 Jun 2012 23:51:39 +0000

Logs are a good way to pin point issues or security breaches. You can configure what is logged by editing the /etc/rsyslog.conf file. The priority of the message will determine which file the logged text is going to be written to. There are 9 priorities that you should be familiar with. The priorities are none, debug, info, notice, warn, err, crit, alert, emerg where debug is the lowest priority and emerg is the highest.

Identify CPU/memory intensive processes, adjust process priority with renice, and kill processes.

Frank Perez — Tue, 19 Jun 2012 23:13:47 +0000

Identifying problems on a system is very important and can save headaches for the future. You can use utilities such as ps, top, kill, and renice to manage and monitor processes on your Linux system.

Use single-user mode to gain access to a system.

Frank Perez — Tue, 19 Jun 2012 12:18:41 +0000

Logging into to single user mode allows you to access the system as root without a password. This is especially useful when you need to troubleshoot or gain access to a system in order to fix a problem.