How to clear Winbind cache Stop the Winbind service : [root@raafat root]# service winbind stop Stop the samba service if you have it : [root@raafat root]# service smb stop Clear the Samba Net cache: [root@raafat root]# net cache flush Delete the Winbind cache : [root@raafat samba]# cd /var/lib/samba/ Always take backup before deleting anything: [root@raafat […]
Centos7 ifconfig not found If you have installed Centos 7 minimall install ,and want to check the server ip ,you will not found ifconfig command ,you have to install its package via the following command : yum -y install net-tools Now,you can use ifconfig command : View All Network Setting ifconfig View information for all […]
How to determine if Linux disk is SSD or HDD : Linux automatically detects SSD, and since kernel version 2.6.29, you may verify sda with: cat /sys/block/sda/queue/rotational You should get 1 for hard disks and 0 for a SSD. In my case, I get 0 (cause it’s a SSD). server:~# cat /sys/block/sdb/queue/rotational 0
Linux Malware Detect (LMD) is a malware scanner for Linux released under the GNU GPLv2 license, that is designed around the threats faced in shared hosted environments. It uses threat data from network edge intrusion detection systems to extract malware that is actively being used in attacks and generates signatures for detection. Installation cd /usr/local/src/ […]
You can disable IPV6 by the following : #nano /etc/sysctl.conf net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 To disable in the running system: echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6 echo 1 > /proc/sys/net/ipv6/conf/default/disable_ipv6 or sysctl -w net.ipv6.conf.all.disable_ipv6=1 sysctl -w net.ipv6.conf.default.disable_ipv6=1
You can free up the memory cache on Linux OS by the following : sudo sh -c “sync; echo 3 > /proc/sys/vm/drop_caches” Ex. root@s1:~# free -m total used free shared buffers cached Mem: 323078 319647 3430 0 705 175763 -/+ buffers/cache: 143178 179899 Swap: 11583 29 11554 root@s1:~# sh -c “sync; echo 3 > […]
Bash history size is specified in HISTSIZE environment variable ,So if you want to increase the size of history ,you have to increase the value of HISTSIZE . To know the current size : echo $HISTSIZE && echo $HISTFILESIZE To increase the size to 10000 : echo -e ‘export HISTSIZE=10000 nexport HISTFILESIZE=10000’ >>~/.bash_profile echo -e […]
Remove Guest Session from Ubuntu Ubuntu come with a “Guest Session” account, which anyone can log into without password ,you can disable the guest account by following these steps : edit lightdm.conf which controls LighDM display manager : vi /etc/lightdm/lightdm.conf [SeatDefaults] greeter-session=unity-greeter user-session=ubuntu allow-guest=false restart the graphical desktop environment: sudo restart lightdm To Enable the […]
This document will help you in modifying server clock and timezone,You can keep the hardware clock in UTC or localtime. Linux looks at /etc/localtime to determine the current time of your machine ,Timezone files are located in /usr/share/zoninfo/ ,So if you are in Saudi Arabia (Riyadh) and want to configure the time on the server […]
Recently ,I have taken a template from Centos 6 on Cloudstack and when trying to bring up a new VM from the template and trying to start the network service received the error: “device eth0 does not seem to be present, delaying initialization” When investigating the problem ,It turns out that the NIC on the machine […]
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