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Support for 32 bit development libraries on 64 bit CentOS

Submitted by sandip on Fri, 07/18/2008 - 09:45. | Tags:
1
point

To support C/C++ 32 bit development libraries on CentOS-5.2 x86_64 arch the below devel packages are required:

yum install glibc-devel.i386 libstdc++-devel.i386

Below is example output of multilib support for gcc:

$ gcc -print-multi-lib; gcc -print-multi-os-directory; gcc -print-multi-os-directory -m32
.;
32;@m32
../lib64
../lib

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Create users in OpenVZ Containers

Submitted by sandip on Fri, 07/11/2008 - 00:35. | Tags:
1
point

Helper script to create users on all OpenVZ VEs simultaneously:

#!/bin/bash
# create_ve_users.sh
# Usage: ./create_ve_users.sh <username> <password> <uid> <group1,group2>

USERNAME=$1
PASSWORD=$2
USERID=$3
GROUP=$4
EXPECTED_ARGS=4

OUT_FILE=.create_users_$$

if [ $# -ne $EXPECTED_ARGS ]
then
  echo "Usage: `basename $0` <username> <password> <uid> <group1,group2>"
  exit 65
fi

VE_LIST=$(/usr/sbin/vzlist -H -o veid)

for VE in ${VE_LIST}
do
        vzctl exec $VE \
                "echo useradd -u $USERID -G $GROUP -p \''`openssl passwd -1 $PASSWORD`'\' $USERNAME > /tmp/${OUT_FILE} ; \
                sh /tmp/${OUT_FILE} ; \
                rm -f /tmp/${OUT_FILE}"
done

exit 0

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Update OpenVZ containers

Submitted by sandip on Wed, 07/09/2008 - 16:51. | Tags:
1
point

If you manage several OpenVZ containers, here is a simple bash script to keep the OpenVZ containers upto date.

#!/bin/bash
# vzyum_updates.sh
# updates VEs

VE_LIST=$(/usr/sbin/vzlist -H -o veid | grep -v Warning)

for VE in ${VE_LIST}
do
  /usr/bin/vzyum $VE update
done

exit 0

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OpenVZ CentOS template cache creation with vzpkgcache

Submitted by sandip on Mon, 07/07/2008 - 23:44. | Tags:
1
point

Following the instruction over at OpenVZ Wiki, I've had no problems with the installation and creation of templates prior to CentOS-5.2 on x86_64 systems. However, with the latest set of updates to CentOS-5.2, the vzpkgcache seems to have been broken as sysklogd is no longer being installed by default. Below is how I got it to work:

Note: edit /vz/template/centos/5/x86_64/config/minimal.list and append .x86_64 to all except for the addons packages. Then run:

# vzpkgcache -f centos-5-x86_64-minimal

which gives the below error at the end:

sed: can't read /etc/init.d/syslog: No such file or directory
ERROR: Script install-post failed

The solution was to edit "/vz/template/centos/5/x86_64/config/install-post" and set syslog and syslog.conf sed replacements with exit status of "0".

# Disable klogd
$VZCTL exec2 $VEID \
        "sed -i -e 's/daemon\\ klogd/passed\\ klogd\\ skipped/' \
                -e 's/killproc\\ klogd/passed\\ klogd\\ skipped/' \
                        /etc/init.d/syslog; exit 0"
...
# Disable fsync() in syslog
$VZCTL exec2 $VEID \
        "sed -i -e 's@\\\([[:space:]]\\\)\\\(/var/log/\\\)@\\\1-\\\2@' \
                /etc/syslog.conf; exit 0"

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Reducing logical volume

Submitted by sandip on Thu, 07/03/2008 - 09:56. | Tags:
1
point

I've had to reduce the logical volume that was alloted for mysql data from 8GB to 4GB, which was a breeze with e2fsadm available for lvm1 on RHEL-3 .

Stop the running serivces using the volume:

# service stop httpd
# service stop mysqld

e2fsadm will reduce the filesystem and then the logical volume.

# umount /mnt/lv-mysql
# e2fsadm -L -4G /dev/hdb2-vg00/lv-mysql
# mount /mnt/lv-mysql

Check with df, which should now show the new volume size:

$ df -h /mnt/lv-mysql
Filesystem              Size  Used Avail Use% Mounted on
/dev/hdb2-vg00/lv-mysql 4.0G  531M  3.3G  14% /mnt/lv-mysql

Start the running serivces using the volume:

# service start httpd
# service start mysqld

Note: e2fsadm is not available in lvm2 and will need to reduce in two steps:

1. Reduce the filesystem residing on the logical volume.
2. Reduce the logical volume.

# resize2fs /dev/vg0/lv0 4G
# lvreduce -L -4G /dev/vg0/lv0

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ffmpeg with mp3 encoder support on Ubuntu Dapper

Submitted by sandip on Wed, 07/02/2008 - 00:26. | Tags:
1
point

The default install of ffmpeg on Ubuntu Dapper does not come with support for encoding mp3. I had to get the source and re-compile with mp3 support using lame as the encoder.

Make sure you have multiverse and universe enabled.

$ sudo apt-get build-dep ffmpeg
$ sudo apt-get install liblame-dev libfaad2-dev libfaac-dev libxvidcore4-dev liba52-0.7.4 liba52-0.7.4-dev libx264-dev
$ apt-get source ffmpeg
$ cd ffmpeg-*/
$ ./configure --enable-gpl --enable-pp --enable-pthreads \
        --enable-libogg --enable-a52 --enable-dts \
        --enable-dc1394 --enable-libgsm --disable-debug --enable-mp3lame \
        --enable-faad --enable-faac --enable-xvid --enable-x264
$ make
$ sudo make install

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Password Less SSH LOGIN

Submitted by manoj on Thu, 06/26/2008 - 19:55. | Tags:
2
points

The main idea behind having a Password Less SSH LOGIN is to be more secure over the internet.
The idea comes from encryption. A set of Public and Private Keys are generated.
The public key stays on the serve rand the private key stays with the user. Only they private key can talk to the public key.

The user needs to upload the public key to the server on
~/.ssh folder and name the file as authorized_keys2

To get the keys working make sure the folder permissons are set correct.

chmod 700 ~/.ssh
chmod 644 ~/.ssh/authrozied_keys2

»

APF on CentOS-5 OpenVZ Containers

Submitted by sandip on Tue, 06/24/2008 - 12:00. | Tags:
1
point
  1. Increase the NUMIPTENT values in VE conf file to 1000 on the host:
    NUMIPTENT="1000:1000"

  2. Edit "/etc/sysconfig/vz" on the host:
    IPTABLES="ipt_REJECT ipt_tos ipt_TOS ipt_LOG ip_conntrack ip_conntrack_ftp ip_conntrack_irc ipt_owner ipt_length ipt_limit ipt_multiport iptable_filter iptable_mangle ipt_TCPMSS ipt_tcpmss ipt_ttl ipt_length ipt_state iptable_nat ip_nat_ftp ipt_recent"

  3. Make sure the above modules are loaded on the host, so it would help if you have APF on the host as well.
  4. Restart the VE
    # vzctl restart <VEID>

  5. It is normal to get ipt_recent error as below:
    Warning: Unknown iptable module: ipt_recent, skipped

    You can verify the modules loaded via:

    # vzctl exec <VEID> grep ipt_recent /proc/net/ip_tables_matches

    Note: ipt_recent is required for passive ftp to work, else... will need to specify passive ftp ports in ftp conf file and open those ports via apf as well.

  6. Here is a typical apf config on a VE with CentOS-5 running ISPConfig.

    DEVEL_MODE="0"
    IFACE_IN="venet0"
    IFACE_OUT="venet0"
    IFACE_TRUSTED=""
    SET_MONOKERN="1"
    IG_TCP_CPORTS="21,22,25,53,80,81,110,143,443"
    IG_UDP_CPORTS="53"
    EGF="1"
    EG_TCP_CPORTS="21,25,80,443,43"
    EG_UDP_CPORTS="20,21,53"

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Zend Optimizer Installation in Ubuntu

Submitted by manoj on Tue, 06/24/2008 - 11:56.
2
points

I just performed an installation of Zend Optimizer which is a free runtime application that enables php to run files encoded by the Zend Guard running on a server.

You can download it from
http://www.zend.com/en/products/guard/downloads
Selecting the proper Package.

Download it through shell

wget http://downloads.zend.com/optimizer/3.3.3/ZendOptimizer-3.3.3-linux-glibc23-i386.tar.gz
in my case i m using x86 32 bit version

untar the package

tar -xvzf ZendOptimizer-3.3.3-linux-glibc23-i386.tar.gz

Go to the directory

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