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

PHP 5.2.9 Compile with mcrypt failing on CentOS 5

If you are getting the following message while trying to compile PHP 5.2.9 with mcrypt:

/usr/bin/ld: cannot find -lltdl
collect2: ld returned 1 exit status
make: *** [libphp5.la] Error 1

Then try this:

yum install libtool-ltdl-devel

Tags: centos, php, server-administration

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Filed under: Uncategorized by — aaron @ 12:50 am

Compiling PHP 5 on CentOS 5 64 Bit configure: error: mysql configure failed.

If you are receiving the following error while trying to compile PHP 5 on CentOS or RHEL 5 64bit:

configure: error: mysql configure failed. Please check config.log for more information.

And in the config.log you see:

/usr/bin/ld: skipping incompatible /usr/lib/mysql/libmysqlclient.so when searching for -lmysqlclient

Then add the following to your configure line:

–libdir=/usr/lib64 –with-libdir=lib64

Tags: apache, centos, php, server-administration

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Filed under: Uncategorized by — aaron @ 6:19 pm

How to install VMware Tools (ESX, ESXi, VMware Server) on CentOS 5 (linux)

1. In VMware select the option to Install/Upgrade Vmware Tools (in ESXi, you can do this by right clicking on the VM -> Guest -> Install/Upgrade Vmware Tools. This will insert the CD into the drive on your VM.

2. On the VM, do the following to install kernel source:

yum install gcc gcc-c++ kernel-devel -y
ln –s /usr/src/kernels/[your kernel version] /usr/src/linux

3. Mount the CD, and copy the Vmware Tools installation file:

mkdir /mnt/cdrom
mount /dev/cdrom /mnt/cdrom
cd /mnt/cdrom
cp VMwareTools-[version].tar.gz /root
cd /root
umount /mnt/cdrom
tar zxf VMwareTools-[version].tar.gz

4. Install VMware Tools:

cd /root/vmware-tools-distrib
./vmware-install.pl

5. For a standard install, just say yes to all the options.

Tags: esxi, server-administration, vmware

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Filed under: Uncategorized by — aaron @ 6:10 pm

How to Upgrade VMware ESXi 3.5 to ESXi 4.0

To upgrade from VMware ESXi 3.5 to VMware ESXi 4.0 you first need to install the VMware vSphere Host Update Utility:

1. VMware ESXI 4 upgrading release, and extract the file ESXi-4.0.0-0.4.164009-upgrade-release.zip\VMware-viclient.vib\data.tar.gz\data.tar\.\4.0.0\client\VMware-viclient.exe
2. Run the executable to install the VMware vSphere Client 4.0, be sure to select the Install vSphere Host Update Utility 4.0.
3. Run the vSphere Host Update Utility 4.0.
4. Select the server you wish to upgrade, then click Upgrade Host.
5. Select the VMware ESXi 4.0 Upgrade file (for example: ESXi-4.0.0-0.4.164009-upgrade-release.zip)
6. Run VMware vSphere client, login to the host you wish to upgrade. Right click on the server, and click Enter Maintenance Mode.
7. Return back to the vSphere Host Update Utility 4.0, and Accept the agreement.
8. Enter host login details, and click next.
9. Once this has been completed, go back to VMware vSphere client, and Exit Maintenance Mode.

Tags: esxi, server-administration, vmware

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Filed under: Uncategorized by — aaron @ 4:59 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 @ 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

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