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 under /root/testdir/ not accessed for last 45 days ( 24x45 = 1018 hours), run the following command: # tmpwatch 1080 /root/testdir/ You could also specify the atime/mtime/ctime etc, to … [Read more...] about How to Delete the Files Which are Older Than n Days WITHOUT Using find Command
Fedora
Beginners Guide to Global File System 2 (GFS2)
Global File System 2 (GFS2) Global File System 2 (GFS2) is a cluster file system interfacing directly with the kernel VFS layer. This means that the same file system can be mounted and used by multiple cluster nodes simultaneously, while still providing a full regular file system, including features such as support for POSIX ACLs, extended attributes, and quotas. To accomplish this, every node accessing a GFS2 file system uses the cluster infrastructure provided by Corosync and Pacemaker to … [Read more...] about Beginners Guide to Global File System 2 (GFS2)
Managing Clustered Logical Volumes in RHEL Cluster (pacemaker)
Clustered LVM Clustered LVM allows the use of regular LVM volume groups and logical volumes on shared storage. In a cluster configured with clustered LVM, a volume group and its logical volumes are accessible to all cluster nodes at the same time. With clustered LVM, administrators can use the management benefits of LVM in conjunction with a shared file system like GFS2, for scenarios such as making virtual machine images inside logical volumes available to all cluster nodes. The … [Read more...] about Managing Clustered Logical Volumes in RHEL Cluster (pacemaker)
How to monitor the status of dm-multipathing and multipath devices (path groups) in Linux
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, a path will be reported as active ready. The output of multipath -ll provides information on each discovered multipath device. This is comprised of three sections. The sections provide information … [Read more...] about How to monitor the status of dm-multipathing and multipath devices (path groups) in Linux
Understanding Linux multipath (dm-multipath)
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 server in the following diagram has two HBAs, each connected to a separate Fibre Channel switch, which in turn are connected to separate … [Read more...] about Understanding Linux multipath (dm-multipath)
How to change the default permissions on /var/log/audit/audit.log file in CentOS/RHEL
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, we would like to change default permissions on the /var/audit/audit.log from 600 to 640 and also changing group from … [Read more...] about How to change the default permissions on /var/log/audit/audit.log file in CentOS/RHEL