guide:Os

From Dgiref

WARNING:  Time synchronization 

A common source of errors in the establishment of the grid environments is the incorrect or inadequate time synchronization of the participating systems. The common time on the clocks, however, is a necessary prerequisite for the smooth communication between the middleware components, particularly for the Grid Security Infrastructure (GSI). 
It is recommended that all systems start the NTP daemon (ntpd) or at least call regularly ntpdate cronjob. The ntpd or ntpdate should be configure to synchronize the machine's system clock with any known organization with the appropriate time-server or via the competent computer center (or institution).

Optimization notes

Optimizing the configuration: 

Use minimal operating system installation without firewall.
To verify installed packages use the command 
rpm -qa | grep package_name
Install the following additional packages:
yum -y install wget yum rpm make gcc gcc-c++ tar sed zlib openssl
After the installation is complete, turn off any unnecessary services (like gpm, sendmail, cups, haldaemon, messagebus, pcmcia, anacron, atd) with the following command: 
chkconfig <SERVICE> off

Configure the following settings for the server:

```
 
```
```
#!/bin/sh
```
```
# Cleanup services
```
```
 
```
```
lv=12345
```

srvInstall="wget yum rpm make gcc gcc-c++ tar sed zlib openssl"

srvRemove="smartmontools pcsc-lite bluez-utils cups gpm"

srvOff="anacron atd auditd avahi-daemon cpuspeed cups gpm haldaemon ip6tables iptables \

iscsi iscsid iscsid kudzu lm_sensors mcstrans mdmonitor messagebus pcscd readahead_early \

resto recond rpcgssd rpcidmapd xfs yum-updatesd gpfs lvm2-monitor nfslock portmap firstboot \

jexec restorecond sendmail setroubleshoot"

srvStop="acpid apmd bluetooth cpuspeed gpm microcode_ctl pcscd smartd irqbalance mdmonitor"

```
 
```
```
function cleanup {
```
```
    # $1 - list of services
```
```
    # $2 - action
```
```
    # $3 - param
```
```
    for service in $1; do
```
```
        case $2 in
```
```
            srvOff)
```

                chkconfig --level $3 $service off;

                chkconfig --list $service;

```
                echo "Off the "$1
```
```
            ;;
```
```
            srvStop)                  
```
```
                chkconfig $svc off; 
```
```
                service $svc stop;
```
```
                echo "Stop the "$1
```
```
            ;;
```
```
            *)
```
```
                echo "Nothing to do"
```
```
            ;;
```
```
        esac
```
```
    done
```
```
}
```
```
 
```
```
cleanup $srvOff srvOff $lv
```
```
cleanup $srvStop srvStop 
```
```
echo "Remove the "$srvRemove
```
```
yum -y remove $srvRemove
```
```
echo "Install the "$srvInstall
```
```
yum -y install $srvInstall
```
```
# security updates
```
```
yum update
```

download administrator's script: note.sh

guide:Os

Optimization notes

Views

Personal tools

general

guidelines

reference installation

Search

internal

Toolbox