Posts Tagged Linux

VMware Player (Linux), Add NIC to Host

It is quite difficult to find information on Internet talking about how to configure NIC for Linux VMware Player.
After studying installed files, I found out it has a command called “vmware-netcfg” which stores in “/usr/lib/vmware/bin“.

We can use this program to configure which NIC will be used for Virtual Machine networking.

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Linux: Disable check disk at start up

E.g. Disable check disk for /dev/sda1

tune2fs -c 0 -i 0 /dev/sda1

Edit /etc/fstab and modify last field to 0 instead of 1 or 2

/dev/sda2                /                       ext3    defaults       1 0
/dev/sda1             /boot                   ext3    defaults        1 0
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Fedora Live CD login as root

Fedora Live CD Default login user is “liveuser”, when I use Live CD for system recovery or maintenance purpose, I will face access denied problem while accessing to different folders.

Following is a way for logging as root by using Fedora Live CD. (I tested this approach on Fedora Live CD 10)

1. Ctrl+Alt+F2
2. Login as root without password
3. cd /etc/pam.d/
4. vi gdm
5. Comment the following line
#auth       required    pam_succeed_if.so user != root quiet

6. save the change
7. Back to the graphical login screen.
8. You can use root as login user now.

Enjoy it !!

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Check USB harddisk mounted or not in Linux

Today, I am checking how to use a script to check if USB hard disk is mounted or not in Linux.

After doing research, I developed the following script to check “mount” status.

1. Create a file chk_mount.sh.
2. chmod 755 chk_mount.sh
3. Add the follow content to “chk_mount.sh”.

if mount | grep sdb1 > /dev/null
then
        echo "sdb1 mounted"
else
        echo "No sdb1"
        mount /dev/sdb1 /backup
fi

If sdb1 is mounted, there is no action will be taken.
If sdb1 is not mounted, /dev/sdb1 will be mounted automatically.

You can put this script in cron job and check  mount status regularly.

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How to check disk usage in Linux?

1. Login into Linux

2. Run the following command

3. Type df -h in command prompt

Linux df

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How to check top level folder usage in Linux?

1. Login into Linux

2. cd /

3. du -h –max-depth=1

Linux du

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PostgreSQL tuning (Linux kernel parameters)

Edit file /etc/sysctl.conf

Add the following lines

kernel.shmmax=2147483648
vm.overcommit_memory=2

kernel.shmmax
1. Around 1/2 of the total system memory
e.g. 4GB system memory, kernel.shmmax =  2 x 1024 x 1024 x 1024

Modify postgresql server effective cache settings
edit /var/lib/pgsql/data/postgresql.conf

effective_cache_size = 1800MB

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