How to remove application/program Gentoo (emerge/unmerge)

To uninstall a package on Gentoo:

#emerge –unmerge <application>

Tags: gentoo, linux, system administration

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tags: gentoo, linux, system administration
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Filed under: Uncategorized by — aaron @ 10:17 pm

How to upgrade Gentoo (emerge)

The basic way to upgrade Gentoo, is the following:

# emere –sync

Once this has been competed:

# emerge -uDv world

Tags: gentoo, linux, server-administration

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tags: gentoo, linux, server-administration
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Filed under: Uncategorized by — aaron @ 10:06 pm

Reconfiguring IP in XenServer via command line

If you need to reconfigure an IP address of XenServer via the command line.

xe pif-reconfigure-ip uuid= mode=static IP= gateway= netmask=

If using DHCP for assigning IPs, then,

#xe pif-reconfigure-ip mode=dhcp uuid=

If using STATIC then,

#xe pif-reconfigure-ip mode=static DNS= gateway=<IP of Gateway> IP= netmask= uuid=

If a server has multiple network cards you can use the following commands to assist in establishing the active link:

xe pif-plug uuid
xe pif-list

Tags: vds, xen, XenServer

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Filed under: Uncategorized by — aaron @ 5:52 pm

Ubuntu: Disabling Service on Startup

A quick way to disable a service so it does not start while your Ubuntu machine is booting is:

# update-rc.d -f <service name to remove>

Tags: linux, system administration, ubuntu

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tags: linux, system administration, ubuntu
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Filed under: Uncategorized by — aaron @ 6:10 am

How to enable root login in Ubuntu 7/8

If you are having trouble looking into root on Ubuntu 7 or 8, here is a quick way to enable root access:

# sudo passwd root

# sudo passwd -u root

Disable Root Login:

# sudo passwd -l root

Tags: linux, system administration, ubuntu

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tags: linux, system administration, ubuntu
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Filed under: Uncategorized by — aaron @ 12:05 am

HyperVM: remote_authentication_failed / Can’t reset password in HyperVM

Error: HyperVM: remote_authentication_failed

If you are receiving this error, and HyperVM won’t reset the password on the slave server, you can manually do this on the slave server using the following commands:

# cd /usr/local/lxlabs/hypervm/httpdocs
# lphp.exe ../bin/common/resetpassword.php slave ‘password’

You then may need to force delete, and re-add the server with the new password.

Tags: hypervm, linux, xen

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tags: hypervm, linux, xen
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Filed under: Uncategorized by — aaron @ 12:16 am

Where did netconfig go? (CentOS/RHEL)

I recently noticed that netconfig had recently disappeared from CentOS 5/RHEL 5 so did a bit of research and found that netconfig has been replaced by system-config-network.

Tags: linux, networking, system administration

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tags: linux, networking, system administration
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Filed under: Uncategorized by — aaron @ 7:40 pm

HyperVM: Kernel image does not exist: /boot/hypervm-xen-vmlinuz

Error: HyperVM: Kernel image does not exist: /boot/hypervm-xen-vmlinuz

To fix this error, login to the HyperVM slave and run the following:

# cd /usr/local/lxlabs/hypervm/httpdocs

# lphp.exe ../bin/misc/fixfc6xen.php

Tags: hypervm, linux, vds, xen

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Filed under: Uncategorized by — aaron @ 7:59 am

What is the pcscd?

Q: What is the pcscd used for on Linux?

A: The pcscd is used for manage connections to smart card readers.  You can disable this service unless you are using a smart card reader on your computer or server.

Tags: linux, security, system administration

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Filed under: Uncategorized by — aaron @ 1:35 am

What is hidd?

Q: What is the hidd service on Linux used for?

A: hidd is the bluetooth H.I.D. server.  This is only required if you are using bluetooth on your computer or server.

Tags: linux, security, system administration

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Filed under: Uncategorized by — aaron @ 1:31 am