How to setup logging on tftp on Linux

Set up logging by opening /etc/xinetd.d/tftp and adding the -v (verbose) option to server_args, and then you can tail /var/log/messages to see the results.

Tags: cisco, linux, server-administration

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Filed under: Uncategorized by — aaron @ 8:03 am

How to install Webmin on Ubuntu 9.04 by using Ubuntu (.deb) Packages

Before downloading or install the .deb Webmin package run the following commands, the 1st command will install the tool wget for download packages from the internet,

sudo apt-get install wget

The next set of commands will install some perl-related libraries required by webmin,

sudo apt-get install perl libnet-ssleay-perl openssl libauthen-pam-perl libpam-runtime libio-pty-perl libmd5-perl

If you run into any issues running the above perl relatd commands, try running the following first,

sudo apt-get update

Now we can download the Webmin .deb package,

wget http://prdownloads.sourceforge.net/webadmin/webmin_1.480_all.deb

Install the Debian package with dpkg, not Aptitude,

sudo dpkg -i webmin_1.480_all.deb

To access your successful install of webmin, goto https://[serverIP]:10000

Tags: control panels, linux, server-administration, ubuntu

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Filed under: Uncategorized by — ross @ 12:46 am

Howto Disable Firewall (iptables) in Linux (Redhat/Fedora/CentOS)

You can run the following to stop iptables from running, by default on Redhat Entrprise Linux 4 and 5, Fedora, and CentOS the firewall is enabled:

chkconfig iptables off
service iptables save
service iptables stop

Tags: centos, linux, redhat, security

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Filed under: Uncategorized by — aaron @ 12:49 am

How to find out which processes are using RAM in Linux?

An easy quick way to find out which processes are using RAM in linux is the following:

top -c

Then

Shift + M

This will list the top processes using the most RAM.

Tags: centos, linux, server-administration

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Filed under: Uncategorized by — aaron @ 12:46 am

How to install Sendmail on a new server?

yum install sendmail

If you are getting the following error in /var/log/maillog while sending an email
————————–
Dec 4 09:01:28 servername sendmail[12467]: iA4H1SCV012467: to=whoever@domain.com, ctladdr=whatever
(whatever/groupid), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30059, relay=[127.0.0.1]
[127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
——————————-

1) Make sure that 127.0.0.1 is listed in /etc/mail/access and /etc/hosts.

2) In the file /etc/mail/sendmail.mc comment out the line below by prepending it with ‘dnl”,like

dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA’)

3 Rebuild sendmail.cf

m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

4)Restart sendmail

service sendmail restart

While rebuilding, some times we may encounter the following error:
=======================
/etc/mail/sendmail.mc:10: m4: cannot open `/usr/share/sendmail-cf/m4/cf.m4′: No such file or directory
======================
Then

>> yum install sendmail-cf

After that repeat, step 3 and 4. Now try to send mail using “mail -v” and it should work fine.

Thanks Gopi for this article!

Tags: linux, mail, server-administration

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Filed under: Uncategorized by — aaron @ 12:44 am

yum upgrade error (openvz) on Lxlab’s HyperVM

When I try and do a yum upgrade on an HyperVM openvz node, I’m getting the following error:

Total download size: 220 M
Is this ok [y/N]: y
Downloading Packages:
http://download.lxlabs.com/download/update/centos-5/x86_64/t emp/x86_64/php-5.2.6-5.x86_64.rpm: [Errno 14] HTTP Error 404: Not Found
Trying other mirror.
http://download.lxlabs.com/download/update/centos-5/x86_64/t emp/x86_64/php-cli-5.2.6-5.x86_64.rpm: [Errno 14] HTTP Error 404: Not Found
Trying other mirror.
http://download.lxlabs.com/download/update/centos-5/x86_64/t emp/x86_64/php-common-5.2.6-5.x86_64.rpm: [Errno 14] HTTP Error 404: Not Found
Trying other mirror.

Error Downloading Packages:
php - 5.2.6-5.x86_64: failure: temp/x86_64/php-5.2.6-5.x86_64.rpm from lxlabsupdate: [Errno 256] No more mirrors to try.
php-cli - 5.2.6-5.x86_64: failure: temp/x86_64/php-cli-5.2.6-5.x86_64.rpm from lxlabsupdate: [Errno 256] No more mirrors to try.
php-common - 5.2.6-5.x86_64: failure: temp/x86_64/php-common-5.2.6-5.x86_64.rpm from lxlabsupdate: [Errno 256] No more mirrors to try.

To fix this, you can run the following:

yum clean all

yum upgrade

Tags: centos, hypervm, linux, lxlabs, yum

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Filed under: Uncategorized by — aaron @ 3:05 pm

How to find out which processes are using RAM in Linux?

An easy quick way to find out which processes are using RAM in linux is the following:

top -c

Then

Shift + M

This will list the top processes using the most RAM.

Tags: centos, linux, server-administration

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Filed under: Uncategorized by — aaron @ 6:44 pm

Debian 5 (Lenny) VPS Plans Available at Crucial Paradigm!

That’s right, we now have Debian 5 (Lenny) available on our current VPS plans!  Just select Debian 5 while placing your order, or from the VPS control panel you can rebuild your VPS with Debian 5 (all data will be lost if you do this!).

Debian 5 (Lenny) VPS plans

Tags: debian, linux, server-administration

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Filed under: Uncategorized by — aaron @ 11:59 pm

How to install Webmin on Gentoo

To install Webmin on a new installation of Gentoo, you can do the following:

Sync your list of available packages:

emerge –sync

Upgrade/Install Portage:

emerge portage

Install Webmin

emerge webmin

Start Webmin

/etc/init.d/webmin start

If you want Webmin to start automatically when your server/VPS boots:

eselect rc add webmin default

Tags: gentoo, linux, server-administration

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Filed under: Uncategorized by — aaron @ 4:31 pm

Fantastico not installing (Not Installed)

Sometimes, even after we install fantastico it will show as “Not Installed”. Or during the installation itself, it may show an error message like “Buggy version of wget”.

To fix this, we need to correct the version of wget.

For 32-bit:

rpm -qa wget
wget http://mirrors.kernel.org/fedora/core/5/i386/os/
Fedora/RPMS/wget-1.10.2-3.2.1.i386.rpm
rpm -e wget
rpm -ivh –force wget-1.10.2-3.2.1.i386.rpm
rpm -qa wget

For 64-bit:

rpm -qa wget
wget http://download.fedora.redhat.com/pub/fedora/linux/releases/7/
Everything/x86_64/os/Fedora/wget-1.10.2-15.fc7.x86_64.rpm
rpm -e wget
rpm -ivh –force wget-1.10.2-15.fc7.x86_64.rpm
rpm -qa wget

Thats it!!!

Thanks for this article Gopi!

Tags: centos, fantastico, linux, server-administration

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Filed under: Uncategorized by — aaron @ 9:35 pm