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3 Step to keep track OS memory usage by process

Tutorial So many people asking how to keep track on the OS memory usage by process, as you know a bit about Physical Memory, Virtual Memory (VSZ), Resident Set Size (RSS), Shared Memory, Paging Memory…etc, counting RSS to determine memory usage is very common way and easier to understand for dummies like me, although it’s […]


Ubuntu 10.10 Maverick with HP Elitebook 2540p – Updated

Background After thousand time try and errors with linux distribution, opensuse, fedora, ubtuntu… etc, finally get it work perfectly on ubtuntu 10.10 Alpha 2 installation. There is some changes since 10.04, /etc/X11/xorg.conf is no more present after installation, Xorg now communicate with dbus to get best configure for your hardware. You may experience blank screen, […]

Pacemaker non-clones resource restart when clones stop/start on other nodes

Scenario Node alpha holds resource groups rg_vg01. Node beta holds the corresponding resources as same as alpha Both nodes hold instances of the CLVM DLM clone. As beta is switched into standby mode, the clone instance on beta correctly transition to the Stopped state. However, the rg_vg01 resource groups are restarted in-place on alpha needlessly. […]


howto create GFS on DRBD network disk mirroring

Introduction This howto will cover how to create a DRBD disk set with GFS concurrent disk access setup. Why DRBD? DRBD disk mirroring benefit as a shared SAN disk to archive higher service resilience with low cost hardware component. Alternately, it may be configured for backup purpose with it’s flexibility. Prerequisite 1. RedHat Cluster Suit […]

Openldap recovery howto

If you are experiencing LDAP errors or startup without error but no ldap port (389|636) is listening for service and you have tried restarting the LDAP server by running /etc/init.d/ldap restart, then you should try running the following recovery procedure: Typical corruption 1. Stop the LDAP server: 2. Run the daemon manually with debug flag […]


howto reinstall GRUB in rescue mode while using lvm / mdadm

This article is how to activate LVM and mdadm software raid in rescue and reinstall GRUB boot loader, since the boot CD will not do this job for you. By following the steps, you may able to do system recovery or disk operation. RedHat 5.x Activate the RAID

Enlarge linux software mirror raid 1 howto

Scenario A linux box running on a software raid 1 mirror harddisk (120GB), recently the server is running out of disk space. A new pair of harddisk with larger capacity (500GB) is going to replace the existing pair. Current disk layout 100MB md0:/dev/sda1, /dev/sda2 111GB md1:/dev/sdb1, /dev/sdb2 /boot /dev/md0 VolGroup00 /dev/md1 – LogVol00 swap – […]

Add a cron job in a command line

As you familiar with UNIX cron with crontab -e when you going to add a new schedule cron job.. do you ever tried to add a cron job up to 100 machine? Simply to use pipe-in with crontab -l to regenerate the crontab. Here you are Easy?!

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