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April 17, 2019 – 4:51 pm

Just a quick collection of notes on – rather than a definitive guide to – setting up an SSH chroot jail on RHEL 6. The same should work on RHEL 7 and unrelated flavors. For …

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Networking

Unix and Linux network configuration. Multiple network interfaces. Bridged NICs. High-availability network configurations.

Applications

Reviews of latest Unix and Linux software. Helpful tips for application support admins. Automating application support.

Data

Disk partitioning, filesystems, directories, and files. Volume management, logical volumes, HA filesystems. Backups and disaster recovery.

Monitoring

Distributed server monitoring. Server performance and capacity planning. Monitoring applications, network status and user activity.

Commands & Shells

Cool Unix shell commands and options. Command-line tools and application. Things every Unix sysadmin needs to know.

Useful awk one-liners

November 19, 2005 – 10:38 pm
colorful shells

Useful awk code snippets for your sysadmin tasks.

Copy directory structure and files with cpio

November 19, 2005 – 10:38 pm
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A basic command to copy directory structure and contents using cpio.

Using FTP with pipes

November 19, 2005 – 10:37 pm
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Pipe in Unix is a method of passing information from one command to another. The pipe take the output of the first command and sends it as input for the second command. The a second …

Create TAR and pipe through gzip

November 19, 2005 – 10:36 pm
shell

A simple example of creating a gzip-compressed tar archive of the current directory.

Fsck operations

November 19, 2005 – 10:36 pm
hard_disk_drive_hdd_0004

The following is a collection of examples using fsck command. It is important to unmount VXFS before running fsck on Veritas filesystem.

RSync remote copy

November 19, 2005 – 10:35 pm
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The following is an example of using rsync to perform a irectory copy between two hosts over the network.

Oracle reinstallation

November 19, 2005 – 10:35 pm

Before beginning Oracle REinstall, make sure to remove the /var/opt/oracle/oraInst.loc file created by /tmp/orainstRoot.sh script during prior installation

Create and mount ISO image under Solaris

November 19, 2005 – 10:33 pm
solaris_logo

Here’s an example of creating and mount a CS ISO image under Solaris.