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Linux
CentOS 6.4, OpenVZ & OpenVZ Web Panel
How to install OpenVZ in CentOS 6.4
I’ve used the CentOS-6.4-x86_64-minimal.iso image to install the OS.
A pretty good installation guide is located on the OpenVZ webpage.
The minimal installation does not have “wget” installed – so I’ve installed it first.
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[root@centos ~]# yum install wget |
After that you can follow the original instruction or use this shortcut
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wget -P /etc/yum.repos.d/ http://ftp.openvz.org/openvz.repo rpm --import http://ftp.openvz.org/RPM-GPG-Key-OpenVZ yum install vzkernel vzctl vzquota ploop |
Reboot
This part was pretty easy, some troubles caused the installation of the web panel.
Install the OpenVZ Web Panel
https://code.google.com/p/ovz-web-panel/
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wget -O - http://ovz-web-panel.googlecode.com/svn/installer/ai.sh | sh |
..and here comes the first problem:
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Complete! ERROR: http://gems.rubyforge.org/ does not appear to be a repository ERROR: could not find gem sqlite3 locally or in a repository Checking presence of the command: ruby Ruby version: 1.8.7 Checking presence of the command: gem RubyGems version: 1.3.5 Checking Ruby SQLite3 support: ruby -e "require 'rubygems'" -e "require 'sqlite3'" Fatal error: Ruby SQLite3 support not found. Please install it first. |
The used gem source is unavailable. Let’s add a new one:
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gem sources -a http://rubygems.org |
The sources list is in a file in your home directory – I suggest to remove the not-working one
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vi ~/.gemrc |
After that let’s start the script again.
This time it worked but all connection to the port 3000 are blocked, so we need to add an IPTABLES rule
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iptables -I INPUT -m state --state NEW -m tcp -p tcp --dport 3000 -j ACCEPT iptables-save |
Right now the web panel should be available
Hints:
1)If any errors appear while adding new hosts about missing net/ssh or net/sftp simply install them:
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gem install net-ssh gem install net-sftp |
2) The first time when I was testing OpenVZ using a netinst image I’ve unnecessarily updated the gem system resulting in this:
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undefined method `source_index' for Gem:Module (NoMethodError) |
The solution was to downgrade it:
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gem update --system 1.8.25 |
SSH escape sequences
Ever found yourself in a situation where your SSH connection simply froze and you were not able to do anything.
A possible solution for this kind of problem are the SSH escape sequences.
To execute them you have to enter to a new line (so simply press “enter” on your keyboard), hit shift, press the back tick (`) to get the tilde (~) character and follow with the keys as described below.
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[root@localhost ~]# ~? Supported escape sequences: ~. - terminate connection (and any multiplexed sessions) ~B - send a BREAK to the remote system ~C - open a command line ~R - Request rekey (SSH protocol 2 only) ~^Z - suspend ssh ~# - list forwarded connections ~& - background ssh (when waiting for connections to terminate) ~? - this message ~~ - send the escape character by typing it twice (Note that escapes are only recognized immediately after newline.) |
So to wrap it up:
press “enter” ~. to close the ssh connection