Showing posts with label CentOS. Show all posts
Showing posts with label CentOS. Show all posts

Monday, 20 October 2014

WEBMIN- Managing Unix Systems Graphically

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What is Webmin?

Webmin is a web-based interface for system administration for Unix. Using any modern web browser, you can setup user accounts, Apache, DNS, file sharing and much more.

Demo:

http://webmin-demo.virtualmin.com/   login: demo &  password: demo.

Download Link:

How to Install:

Install on RedHat/CentOS/Fedora:

If you are using the RPM version of Webmin, first download the file from the downloads page , or run the command :
[root@UMLinux1 ~]# wget http://prdownloads.sourceforge.net/webadmin/webmin-1.710-1.noarch.rpm

and then run the command

[root@UMLinux1 ~]# rpm -U webmin-1.710-1.noarch.rpm
The rest of the install will be done automatically to the directory /usr/libexec/webmin, the administration username set to root and the password to your current root password. You should now be able to login to Webmin at the URL http://localhost:10000/.Or if accessing it remotely, replace localhost with your system's IP address.

If you want to connect from a remote server and your system has a firewall installed, see this page for instructions on how to open up port 10000.

Install on Debian:

If you are using the DEB version of webmin, first download the file from the downloads page , or run the command :
[root@UMLinux1 ~]# wget http://prdownloads.sourceforge.net/webadmin/webmin_1.710_all.deb

then run the command :

[root@UMLinux1 ~]# dpkg --install webmin_1.710_all.deb
The install will be done automatically to /usr/share/webmin, the administration username set to root and the password to your current root password. You should now be able to login to Webmin at the URL http://localhost:10000/. Or if accessing it remotely, replace localhost with your system's IP address.

How to Stop& Start Webmin Services:

In order to start the Webmin service on CentOS (Linux) you will need to issue the following command:
[root@UMLinux1 ~]# service webmin start
You can check to make sure that Webmin is running by issuing the following command:
[root@UMLinux1 ~]# service webmin status
Webmin (pid 1729) is running
[root@UMLinux1 ~]#
If you wish to configure your server to ensure that the Webmin service is started at boot time you can issue the following command:
[root@UMLinux1 ~]# chkconfig --level 3 webmin on
To verify that Webmin will start at boot, issue the following command:
[root@UMLinux1 ~]# chkconfig --list webmin
webmin 0:off 1:off 2:off 3:on 4:off 5:off 6:off
[root@UMLinux1 ~]#
In the previous listing, Webmin is listed to start in run level 3, which is the default run level that the dedicated servers boot into.

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Monday, 14 July 2014

Install SNMP Service on RHEL or CentOS

By , , 1 comment

Install SNMP Service on RHEL or CentOS

In this article  we are going to learn  how to install and start  SNMP service in RHEL/CentOS.

We need  to have  net-snmp rpm package installed on the servers , generally it would come with repository.


1. Install net-snmp with yum:

#yum install net-snmp
[root@umserv]# yum install net-snmp
Loaded plugins: dellsysid, fastestmirror
Loading mirror speeds from cached hostfile
-----
-----
Dependencies Resolved

========================================================================================================================================================================
Package    Arch         Version          Repository        Size
========================================================================================================================================================================
Installing:
net-snmp     x86_64   1:5.3.2.2-22.el5_10.1    updates  708 k
Installing for dependencies:
 lm_sensors     x86_64  2.10.7-9.el5       base     525 k
Updating for dependencies:
 net-snmp-libs  i386    1:5.3.2.2-22.el5_10.1    updates  1.3 M
 net-snmp-libs  x86_64  1:5.3.2.2-22.el5_10.1    updates  1.3 M

Transaction Summary
========================================================================================================================================================================
Install      2 Package(s)
Update       2 Package(s)
Remove       0 Package(s)

Total download size: 3.8 M
Is this ok [y/N]: y
Downloading Packages:
(1/4): lm_sensors-2.10.7-9.el5.x86_64.rpm        | 525 kB     00:01
(2/4): net-snmp-5.3.2.2-22.el5_10.1.x86_64.rpm   | 708 kB     00:02
(3/4): net-snmp-libs-5.3.2.2-22.el5_10.1.i386.rpm      | 1.3 MB     00:04
(4/4): net-snmp-libs-5.3.2.2-22.el5_10.1.x86_64.rpm    | 1.3 MB     00:03
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total   168 kB/s | 3.8 MB     00:23
Running rpm_check_debug
Running Transaction Test

Finished Transaction Test
Transaction Test Succeeded
Running Transaction
----
----
Installed:
  net-snmp.x86_64 1:5.3.2.2-22.el5_10.1

Dependency Installed:
  lm_sensors.x86_64 0:2.10.7-9.el5

Dependency Updated:
  net-snmp-libs.i386 1:5.3.2.2-22.el5_10.1 net-snmp-libs.x86_64 1:5.3.2.2-22.el5_10.1

Complete!
[root@umserv]#

2. Simple SNMP configuration:

mv /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.old
Add   below configuration to /etc/snmp/snmpd.conf
rocommunity  public  xxx.xxx.xxx.xxx
rocommunity  public   127.0.0.1
syslocation  "HYD, UM DataCenter"
syscontact  [email protected]

Replace xxx.xxx.xxx.xxx with the IP address of the server that you want to allow SNMP lookups from:
rocommunity public xxx.xxx.xxx.xxx

3. Start the SNMP service, and set it to auto-start on reboot:

/etc/init.d/snmpd start
chkconfig snmpd on
Note:If you have a firewall configured, ensure that you have UDP port 161 open to your SNMP lookup server.

4) Validation:

On your SNMP lookup server, you can do the following to perform a quick SNMP test to ensure that it’s working.
snmpwalk -v 2c -c public xxx.xxx.xxx.xxx or snmpwalk -v 1 -c public -O e 127.0.0.1
[root@umserv ~]# snmpwalk -v 1 -c public -O e 127.0.0.1
SNMPv2-MIB::sysDescr.0 = STRING: Linux umserv 2.6.18-92.1.17.el5 #1 SMP Mon Jul 14 06:07:13 IST 2014 i686
SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (16748) 0:02:47.48
SNMPv2-MIB::sysContact.0 = STRING: [email protected]
SNMPv2-MIB::sysName.0 = STRING: umserv
SNMPv2-MIB::sysLocation.0 = STRING: "HYD, UM DataCenter"
SNMPv2-MIB::sysORLastChange.0 = Timeticks: (1) 0:00:00.01
...
...
Yes, it is working
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