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the mistake: i forgot to remount /home to /dev/mapper/centos-home
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the mistake: i forgot to remount /home to /dev/mapper/centos-home
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it pings! skip to content home articles os linux bsd unix programming python java web html and css javascript php tools networking cisco ids lan vpn wan security multimedia hardware configuration development security troubleshooting usage gaming other videos linux linux zero to hero project security web about us online courses linux tips ( grep the text without hashes and blank lines ) leave a reply in our second post of linux tips i would like to share a very simple example in which i will use grep tool to remove all the hashes and blank lines from a file. in our example we will use file1.txt with the following content linux-11oz:/test # cat file.txt #the file with hashes ### #### ## this is a test file with lots of spaces and few lines with ####hashes ### so lets remove the hashes and blank lines with single grep command we can use the following trick linux-11oz:/test # grep . file.txt | grep -v "#" this is a test file with lots of spaces and few lines with the “.” will remove the blank lines and  “-v” will invert the match of # thats how simple it is. if you know a better way of doing it , please send me an email or comment. email: learning@itpings.com thanks salman a. francis this entry was posted in linux, os, tips and tagged grep, linux, linux howto, linux tips, linux tools on march 22, 2017 by salman. linux tips ( chmod tip ) leave a reply hey guys this is going to be a new series of posts in which i will be sharing some cool linux tips.  you can watch the video of this post on http://www.youtube.com/linuxking so here is the first tip chmod: i hope you guys are already familiar with chmod command if not checkout my youtube “linuxking” channel for theses commands. with chmod you can change the mode of the files and directories. e.g chmod 775 dir  command will change the permission on directory with rwxrwxrw- also using -r option with chmod will change the permission on the directory as well the content within the directory with same permissions. however lets say you want to change the permissions of a directories to executable within a directory without changing permissions of file use the below tip. lets say you have a directory “test1” & “test2” inside “test” directory test directory has also a  file inside it called file1.txt file1.txt has permission rw——- directory test1 has permission rwx—— directory test2 has permission rw——- linux-11oz:/test # ls -ltr total 0 -rw------- 1 root root 0 mar 22 17:06 file.txt drwx------ 1 root root 0 mar 22 17:07 test2 drwx------ 1 root root 0 mar 22 17:07 test1 now if you try to change the permission with a simple ” chmod -r command ” of all the directories to “executable” inside test directory you could also change permission of the file inside test diretory. example: linux-11oz:/ # chmod -r ug+x test/ linux-11oz:/ # cd test/ linux-11oz:/test # ls -ltr total 0 -rwx--x--- 1 root root 0 mar 22 17:06 file.txt (you can see that the file also became executable) drwx--x--- 1 root root 0 mar 22 17:07 test2 drwx--x--- 1 root root 0 mar 22 17:07 test1 now to avoid such situation we will use x instead of x, lets see the impact of x with chmod command linux-11oz:/ # chmod -r ug+x test/ linux-11oz:/ # cd test/ linux-11oz:/test # ls -ltr total 0 -rw------- 1 root root 0 mar 22 17:06 file.txt (you can see the file's permission has not changed to executable) drwx--x--- 1 root root 0 mar 22 17:07 test2 drwx--x--- 1 root root 0 mar 22 17:07 test1 linux-11oz:/test # i hope you have enjoyed this tip, keep visiting our site for more information. this entry was posted in configuration, linux, os, tips and tagged linux, linux command line, linux tricks, tips on march 22, 2017 by salman. feng office 3.4.4.1: fix for missing custom porperty values leave a reply recently i updated the corporate feng office app  to a version 3.4.4.1 and found that some custom properties are not showing in the task view. these custom properties were all of type: list. the values were saving correctly into the db and worked fine in edit view, but as i said, not in the task view. continue reading → this entry was posted in php on march 14, 2017 by roady. recovery of the file system from disaster leave a reply hey guys, long time no see…well i am back and this time the issue is file system. what happened ? well my backup server’s root partition ran out of space due to some issue, and since it was on lvm (logical volume manager) i took some space from my /home partition (it was 400 gb ) and added to my root partition. following commands were used to resize the partition. umount /dev/mapper/centos-home lvreduce -l 200g /dev/mapper/centos-home note first i unmounted the partition and then reduced the space from my /home partition which was mounted as /centos-home i took 200 gb out of it and added to my root partition. the mistake: i forgot to remount /home to /dev/mapper/centos-home but i extended the partition with the following command: lvextend -r -l+100%free /dev/mapper/centos-root as per above command the partition will be re-sized to the 100% free space available from the reduced volume. of course it was 200 gb. all was good when i saw the partition sized changed from no space to +200 gb. but then i realized that i was not able to mount /home to /centos-home and that was the time when all problem started. i “rebooted the machine” and when it came back it refused to enter the normal boot prompt but went into “emergency mode” things i tried: i tried to fix the partition with xfs_repair tool , but in vain , and i received the error that “cannot find super block “ i tried to run the fixes couple of time but failed every time. the fix: i fixed the issue by the following commands: lvremove /dev/mapper/centos-home lvcreate -l 200gb -n home centos mkfs.xfs /dev/centos/home mount /dev/mapper/centos-home luckily there was no important data on my /home partition and i was able to save my server. good practice: if you every fall prey to such situation, remember to “backup” to an external drive and then proceed with the above mentioned technique to rescue yourself from such difficult situation. i hope it will help some one some where, let me know with your feedback. thanks & best regards, salman a. francis this entry was posted in linux, troubleshooting and tagged centos disk failure, filesystem, linux, lvm, lvm extend, lvm recovery, lvm reduce, lvm repair, superblock issue, xfs, xfs recover, xfs repair on january 30, 2017 by salman. it header schema leave a reply here is a quick reference to ip header this entry was posted in networking on november 16, 2016 by roady. linux partitioning of more than 2gb disk leave a reply so just wanted to share how to partition your hard drive from linux command line if you have a drive greater than 2gb. in my case its 3tb and i want to create a single partition out of it. i used “gdisk” , its similar to “fdisk” but can create and understand large disk partitioning system.  root@m-pvps:/# gdisk /dev/sdb gpt fdisk (gdisk) version 0.8.5 partition table scan: mbr: mbr only bsd: not present apm: not present gpt: not present *************************************************************** found invalid gpt and valid mbr; converting mbr to gpt format. this operation is potentially destructive! exit by typing ‘q’ if you don’t want to convert your mbr partitions to gpt format! *************************************************************** command (? for help): now we will type “p” to print partition table. number start (sector) end (sector) size code name 1 2048 52889599 25.2 gib 0700 ##### 2 209713152 216107007 3.0 gib 0700 ##### now i will delete the available partition with “d” command (? for help): d partition number (1-2): 1 now i will delete the 2nd partition with “d” and then typing “2” now i will print the partitioning table with “p” command (? for help): p disk /dev/sdb: 5860533168 sectors, 2.7 tib logical sector size: 512 bytes disk identifier (guid): 7f138376-657f-441a-b784-96e22bdab49d partition table holds up to 128 entries first usable sector is 34, last usable sector is 5860533134 partitions will be aligned on 2048-sector boundaries total free space is 5860533101 sectors (2.7 tib) now i will create the partition with “n” and selecting all the default values. command (? for help): n partition number (1-128, default 1): first sector (34-5860533134, default = 2048) or {+-}size{kmgtp}: last sector (2048-5860533134, default = 5860533134) or {+-}size{kmgtp}: current type is ‘linux filesystem’ hex code or guid (l to show codes, enter = 8300): changed type of partition to ‘linux filesystem’ now i will print the partition table with “p” number  start (sector)    end (sector)  size       code  name 1            2048      5860533134   2.7 tib     8300  linux filesystem now we will write and save partition with “w” command. command (? for help): w final checks complete. about to write gpt data. this will overwrite existing partitions!! do you want to proceed? (y/n): y ok; writing new guid partition table (gpt) to /dev/sdb. the operation has completed successfully. now we will create the file system with “mkfs -t ext3 /dev/sdb” command root@m-pvps:/# mkfs -t ext3 /dev/sdb1 mke2fs 1.42.5 (29-jul-2012) /dev/sdb is entire device, not just one partition! proceed anyway? (y,n) y now you can check the drive with df -h command this entry was posted in uncategorized on november 2, 2016 by salman. linux practical security course leave a reply dear members , i am happy to announce that linux practical security by lzh project is complete. we will launch it shortly. please support us by buying and rating this course. for first 20 buyers there will be a discount of $5. total cost is $25. you can also book your copy by sending me email to learning@itpings.com please take a look at the introductory video here: this entry was posted in configuration, linux, linux zero to hero project, networking, os, security, security, security, troubleshooting, videos and tagged learn linux, linux, linux course, linux security, security on october 21, 2016 by salman. openstack dashboard gives error “error: unable to retrieve information” leave a reply so today i ran into one more issue with openstack , the error showed up  when i logged in to the dashboard and clicked on project–>instances. what i saw terrified me because is saw “nothing” ! a day before i had the same issue and i thought it’s related to ram so i restarted and everything started and operated normally, but this time the reboot didn’t help. so i started scratching my head and started wondering what might be the reason. i searched internet but no success. i searched log files but nothing made sense at that time, so i rebooted one more time and an error appeared saying something like “openstack glance-registry api error limit reached ” so that gave me a head start that it has something to do with system being low in space. a df -h showed that / is 100% full. i removed some unnecessary files , rebooted the system and viola ! all started to work normally. conclusion: make sure you have enough space with openstack this entry was posted in linux, troubleshooting, web and tagged error: unable to retrieve usage information, linux, openstack, openstack error, openstack troublesooting, troubleshooting on october 7, 2016 by salman. unable to connect “the squid error “ leave a reply so today i had a strange problem when i was only able to access google.com and not other sites. i was able to browse gmail, but not mail ru. everything was working fine but out of no where this error “unable to connect” appeared on my browsers. it was kinda strange, since i made no changes to my system” also i was not sure if it’s the system or the gateway. observation on system: 1) both firefox and chrome giving the same problem. 2) i was able to browse with chrome if ultrasuf extension was enabled. 3) firebug reported “aborted” in the net tab steps taken: restarted the system changed the ip address result: system not fixed continue reading → this entry was posted in configuration, linux, os and tagged linux troubleshooting, os configuration, signal 25, solve squid issues, squid, squid codes, squid configuration, squid issues, squid solution, squid troubleshooting on september 30, 2016 by salman. solving call drop issue in elastix / asterisk leave a reply if you change your network and you find that the working elastix / asterisk box is now dropping calls every 15 to 25 secs.  one of the most probable reason is “nat” . the solution which worked for me is changing the sip_custom.conf found in /etc/asterisk/ directory. open it with your favorite editor such as vim or nano and add the following lines. externip=1.1.1.1/255.0.0.0  < your external ip with subnet here > localnet=192.168.1.0/255.255.255.0 < your internal ip with subnet here > canreinvite=no nat=yes qualify=yes promiscredir=yes hope this will help someone. thanks, salman this entry was posted in uncategorized on september 8, 2016 by salman. post navigation ← older posts tagsasterisk bgp ccnp centos cisco dhcp elastix failover firefox 31.0 hsrp installation ipv6 lan layer3 linux linux security linux troubleshooting network networking networks opensuse ospf programming protocol protocols python recovery route router routing sccp scripting security sip solaris solaris 11 stp switch troubleshooting vlans voip vpn wan web wordpress subscribeto our newsletter!leave blank:do not change:your email: archives april 2017 m t w t f s s « mar 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30


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