Centos
Fencing is a mechanism to isolate one node of the cluster in case it is not working properly, usually it happens when a node loses connectivity with the other. (Fencing do not happen in case of resources block or fail). Here is the way to do manual fencing. manual fencing …
I had a problem with Nagios because I needed to set up LDAP access and I didn’t know how to do it. After googling for a while I found out that the solution was to set up LDAP access for APACHE and do few configuration change in Nagios. The first …
Ntpd is a daemon used to keep system time of server synchronized with Internet standard time servers. Ntpd is the acronymous of Network Time Protocol (NTP) daemon. Your server could be a client (asks time) or a server (gives time). Even if you don’t have ntpd set, your server has an internal …
If you want to set an SSH Welcome message in your server, you only need to set motd file and be sure that welcome message is enabled for ssh access Edit Motd File Everything you write in your /etc/motd will be display as a welcome message. vim /etc/motd Hello!!! Welcome, …
I had a problem with my ftp server. After login I cannot upload files on my root directory. After logged into my ftp server i check permission for my user in my home folder. [root@ftp home]# ll dr-xr-x—. 69 myuser ftp 4096 17 nov 17.17 myftphome [root@ftp home]# Now I …
Luci blocked Luci and Ricci are two daemons which help us to manage cluster. They are part of Conga. Luci is a server (accessible through a Web browser) and it allows us to manage cluster node via ricci that is an agent that runs on each node. In case luci …
This post is a collection of cluster suite command and information. Cluser Suite Configuration file: /etc/cluster/cluster.conf Daemons involved: cman rgmanager ricci luci modclusterd clvmd The following are useful to check cluster status and node status server# clustat server# clustat –i 1 // refresh every second server# cman_tool status server# cman_tool …
Tar and Zip are two command useful to compress and extract files. They have lot of parameteres, here are the common parameters I usually use. x = extract c = compress v = output verbose z = compress/extract gzip (file tar.gz o .tgz) f = create folder Tar Decompress Tgz: tar …
Cloning Xen Virtual Machine If you need to clone a Virtual Machine (VM-Original), realized using xen or kvm, to create a new identical Virtual Machine (VM-New), you ‘ll have to use the following command: virt-clone -o VM-Original -n VM-New -f /dev/some_volume_group/LV_VM-New or virt-clone –original VM-Original –name VM-New –file /dev/some_volume_group/LV_VM-New /dev/some_volume_group/LV_VM-New …
VNC is a tool useful to connect a client to a desktop server (vnc server), now i show you how to install vnc server. Install VNC on Centos yum groupinstall “X Window System” yum install xorg-x11-xinit should be already installed, if not… instll it Centos 5 yum install vnc-server Centos 6 …
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