Fedora

Question: How to delete the files which are older than n days WITHOUT use find command? For some reason, the find command is not used to check which files are older than n days, as a substitute, ‘tmpwatch‘ can be used The syntax is: # tmpwatch [time in hours] [directory] For example, to delete files […]

Monitoring The multipath command can be used to monitor the status of multipaths. When used with one -l option, it will show a quick overview of multipath topologies. If the -l option is specified twice (-ll), it will also perform a check on all paths to see if it is active. If everything is fine, […]

What is multipathing? Multipathing allows the combination of multiple physical connections between a server and a storage array into one virtual device. This can be done to provide a more resilient connection to your storage (a path going down will not hamper connectivity), or to aggregate storage bandwidth for improved performance. As an example, the […]

Question: How to configure auditd to change the default permissions on the /var/log/audit/audit.log from 0600 to 0640 and also changing the group ownership of the file? By default it’s not possible to change permissions on the /var/log/audit/audit.log file using ACLs, instead “log_group” parameter can be set under the file /etc/audit/audit.conf. The Steps In this example, […]

Question: A file seems to be disappearing and no direct reason for its disappearance can be found. How can we monitor the file access, especially the deletion of a particular file in CentOS/RHEL system? A file can be monitored through its lifecycle by using the Linux auditd service. The Steps 1. To install it on […]

This post explains how to stop audit log entries written to system logs. 1. Check the file /etc/audisp/plugins.d/syslog.conf. By default, the file “/etc/audisp/plugins.d/syslog.conf will have the below line. args = LOG_INFO This will allow syslog to log audit logs into /var/log/messages. In addition audit.d will log all the audit events to /var/log/audit/audit.log too and this […]

This post explains how to free up space when files under /var/cache/yum is filling up the disk space. This is normal behavior as the cache would increase its size based on the frequency of syncing with the yum server. Its an administrative task provide adequate space. This should be corrected by either running: # yum […]

Squid is a web proxy application with a variety of configurations and uses. Squid has a large number of access controls and supports different protocols, such as HTTP, HTTPS, FTP, and SSL. In this post, we will see how to use Squid as an HTTP proxy. The Setup Squid is quite an old, mature, and […]