Category Archives: tips

How to Install PhPMyAdmin on Centos 7 from source

Dear Friends,

First of all we will install required repositories.

[root@itpings opt]# rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
[root@itpings opt]# yum -y install epel-release

Now we will install apache, mariadb, mariadb-server and php56

[root@itpings opt]# yum -y install httpd mariadb mariadb-server php56w php-mbstring php-mysql php-soap

Once installed we will download phpmyadmin from phpmyadmin.net

[root@itpings opt]# wget https://files.phpmyadmin.net/phpMyAdmin/4.7.2/phpMyAdmin-4.7.2-all-languages.zip

unzip the content and move it to /var/www/html and rename the unzipped content to phpmyadmin

[root@itpings html]# unzip phpMyAdmin-4.7.2-all-languages.zip
[root@itpings html]# mv phpMyAdmin-4.7.2-all-languages.zip phpmyadmin

Now Change the ownership of the folder

[root@red html]# chown -R apache.apache phpMyAdmin
[root@red html]# chmod -R 755 phpMyAdmin

Now we will copy config.sample file to config.ini.php

[root@itpings html]# cp config.sample.inc.php config.inc.php

Now we will edit config.inc.php and only add root user and password of mysql ( Make sure you have root user and password of mysql)

/* User used to manipulate with storage */
 $cfg['Servers'][$i]['controlhost'] = '';
// $cfg['Servers'][$i]['controlport'] = '';
 $cfg['Servers'][$i]['controluser'] = 'root';
 $cfg['Servers'][$i]['controlpass'] = 'itpings123';

Now to visit phpmyadmin visit http://<your-ip-address>/phpmyadmin and provide the above user and password.

Done

Thanks,

Salman A. Francis
YouTube: Linuxking
Facebook: LZHProject, Linuxking77

How to Add Physical Disk to Increase Size of /dev/mapper/centos-root

Dear Friends,

I ran into a problem where my openstack machine ran out of space. My Logical FS /dev/mapper/centos-root was only 50GB and most of the space was lost.

Solution:
LVM

I Added a new 500GB HDD (sdb), created partition with parted (sdb1) and gave the below commands:

[root@stack opt]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created

Next Check your Volumes with “vgdisplay” command

[root@stack opt]# vgdisplay 
 --- Volume group ---
 VG Name centos
 System ID 
 Format lvm2
 Metadata Areas 1
 Metadata Sequence No 4
 VG Access read/write
 VG Status resizable
 MAX LV 0
 Cur LV 3
 Open LV 3
 Max PV 0
 Cur PV 1
 Act PV 1
 VG Size 465.27 GiB
 PE Size 4.00 MiB
 Total PE 119109
 Alloc PE / Size 119109 / 465.27 GiB
 Free PE / Size 0 / 0 
 VG UUID TrvUI3-Xt7U-6vzF-5RtW-OfK0-OCOy-Tejrb6
 
 --- Volume group ---
 VG Name cinder-volumes
 System ID 
 Format lvm2
 Metadata Areas 1
 Metadata Sequence No 5
 VG Access read/write
 VG Status resizable
 MAX LV 0
 Cur LV 0
 Open LV 0
 Max PV 0
 Cur PV 1
 Act PV 1
 VG Size 20.60 GiB
 PE Size 4.00 MiB
 Total PE 5273
 Alloc PE / Size 0 / 0 
 Free PE / Size 5273 / 20.60 GiB
 VG UUID 9LDtLm-52Un-1QJA-yc3q-13vE-LqEc-hX0kiU

Continue reading

Convert pkcs12 key to bks format for Android

Dear Reader,

If you ever want to convert a pkcs12 format key to bks format for Android follow the below instructions.

First of all downlaod bcprov-jdk16-1.46.jar file

[root@itpings certs]# wget http://repo1.maven.org/maven2/org/bouncycastle/bcprov-jdk16/1.46/bcprov-jdk16-1.46.jar
–2017-06-30 17:05:40– http://repo1.maven.org/maven2/org/bouncycastle/bcprov-jdk16/1.46/bcprov-jdk16-1.46.jar
Resolving repo1.maven.org (repo1.maven.org)… 151.101.32.209
Connecting to repo1.maven.org (repo1.maven.org)|151.101.32.209|:80… connected.
HTTP request sent, awaiting response… 200 OK
Length: 1876535 (1.8M) [application/java-archive]
Saving to: ‘bcprov-jdk16-1.46.jar’

bcprov-jdk16-1.46.j 100%[===================>] 1.79M –.-KB/s in 0.02s

2017-06-30 17:05:40 (89.3 MB/s) – ‘bcprov-jdk16-1.46.jar’ saved [1876535/1876535]

Now Convert the File as follow with keytool

[root@itpings certs]# keytool –importkeystore –srckeystore user.P12 -srcstoretype pkcs12 –destkeystore user.bks –deststoretype bks –provider org.bouncycastle.jce.provider.BouncyCastleProvider -–providerpath bcprov-jdk16-1.46.jar
Enter destination keystore password:
Re-enter new password:
Enter source keystore password:
Entry for alias 1 successfully imported.
Import command completed: 1 entries successfully imported, 0 entries failed or cancelled
[root@itpings certs]# ls
user.bks

Done.

Thanks,
Salman Aftab
ITpings
YouTube: LinuxKing
FaceBook: LZHProject

Linux Tips ( grep the text without hashes and blank lines )

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

 

Linux Tips ( chmod tip )

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.