A MySQL crash on Red Hat system resulted with: /etc/init.d/mysql status coming back with: mysql is not running but lock exists Solved by removing the lock file: rm /var/lock/subsys/mysql If this happens again it may also be necessary to remove the pid file from /var/lib/mysql
Posts By: jonny
Password-less SSH for Rsync from Solaris
This short article will demonstrate by example password-less ssh from a Solaris 8 box which will backup the contents of a linux box using rsync.In the example there are 2 users involved and 2 machines involved:User: bak2solaris Machine: mylinuxbox (RHEL/Centos) User: root Machine: mysolarisbox (Solaris 8)A cron job will run on machine 'mysolarisbox' as root…. Read more »
SpamAssassin: Overriding default scores
If desired the default scores for rules in spamassassin (located in /usr/share/spamassassin/50_scores.cf) can be changed by setting the scores either in /etc/mail/spamassassin/local.cf or another .cf file in the directory. For example, my_scores.cf could define: # added an extra half point to the surbl checksscore URIBL_AB_SURBL 2.113score URIBL_JP_SURBL 3.357 score URIBL_OB_SURBL 2.632score URIBL_PH_SURBL 2.535score URIBL_SBL … Read more »
First Aide for Intrusion Detection
I was considering installing tripwire on a CentOS 5.1 install but I happened upon an article about 'aide' which also notifies the system admin about changes to core files (and thus possible intrusions) Of course any genuine newly installed software may also trigger differences in the aide database. yum install aide If not using SELinux… Read more »
Spamassassin and sa-update
Sa-update replaces Rules-Du-Jour providing fresh spam rules to spamassassin in a similar way that freshclam provides viri updates to ClamAV.Presumably Spamassassin is installed but if it isn't: yum install spamassassin* This will install the main package plus the seperate tools package. Some of the plug-ins require specific perl modules so the following might help depending… Read more »
PHP 5.2.5 Plesk Horde Include Error
A recent upgrade to PHP 5.2.5 caused a problem with Plesk/Horde webmail. Specifically: Warning: require_once(Horde/String.php) [function.require-once]: failed to open stream: No such file or directory in /usr/share/psa-horde/lib/Horde/Browser.php on line 4 Fatal error: require_once() [function.require]: Failed opening required ‘Horde/String.php’ (include_path=’/usr/share/psa-horde:/usr/share/psa-horde/pear:.’) in /usr/share/psa-horde/lib/Horde/Browser.php on line 4 The problem is sorted with but this may need to be… Read more »
Password-less SSH in 5 minutes
Connecting to remote servers using SSH is very common in systemadministration and involves entering the command : sshuser@remotehostname and the corresponding password. It is possible to use public keys with SSH to allow the remote host to accept SSH connections from you without password authentication. This can beuseful for automatically scheduled tasks (CRON jobs) for… Read more »
Aptana for Linux Web Development
Aptana is an Eclipse plug-in/perspective aimed at web development including support for Ajax and PHP. With Eclipsed installed, Aptana can be added by: Open Eclipse Choose Help > Software Updates > Find and Install… In the dialog enter 'Aptana' as the name URL is http://update.aptana.com/update/3.2/ Install After installation restart Eclipse and choose Window > Open… Read more »
ProFTPd Port Restriction
Data ports are allocated to FTP clients on connection so it is difficult to know which port an FTP user might be using when they next connect. To narrow it down a little (for a low usage FTP service) I restricted the port range in /etc/proftpd/proftpd.conf with: PassivePorts 49152 49252 Let's see how that goes…
Nagios NRPE Plugin on CentOS
Nagios is is a useful tool for monitoring many servers and their services. At a glance (or via email) you can see which services/hosts are experiencing problems.Monitoring public services such as HTTP, FTP, LDAP, SSH are relatively easy but to go a little further and check disk or swap usage on a remote machine use… Read more »
