Author: ServerOk – Page 2

Gitlab find version

To find version of hosted Gitlab installation, run

gitlab-rake gitlab:env:info

1	gitlab-rake gitlab:env:info

Example

root@simplegitlab:~# gitlab-rake gitlab:env:info

System information
System:		Ubuntu 16.04
Current User:	git
Using RVM:	no
Ruby Version:	2.5.3p105
Gem Version:	2.7.9
Bundler Version:1.17.3
Rake Version:	12.3.2
Redis Version:	3.2.12
Git Version:	2.21.0
Sidekiq Version:5.2.7
Go Version:	unknown

GitLab information
Version:	11.11.0
Revision:	3e8ca2fb781
Directory:	/opt/gitlab/embedded/service/gitlab-rails
DB Adapter:	PostgreSQL
DB Version:	9.6.11
URL:		https://gitlab.simplecloud.co.za
HTTP Clone URL:	https://gitlab.simplecloud.co.za/some-group/some-project.git
SSH Clone URL:	git@gitlab.simplecloud.co.za:some-group/some-project.git
Using LDAP:	no
Using Omniauth:	yes
Omniauth Providers: 

GitLab Shell
Version:	9.1.0
Repository storage paths:
- default: 	/var/opt/gitlab/git-data/repositories
GitLab Shell path:		/opt/gitlab/embedded/service/gitlab-shell
Git:		/opt/gitlab/embedded/bin/git
root@simplegitlab:~#

root@simplegitlab:~# gitlab-rake gitlab:env:info

System information

System: Ubuntu 16.04

Current User: git

Using RVM: no

Ruby Version: 2.5.3p105

Gem Version: 2.7.9

Bundler Version:1.17.3

Rake Version: 12.3.2

Redis Version: 3.2.12

Git Version: 2.21.0

Sidekiq Version:5.2.7

Go Version: unknown

GitLab information

Version: 11.11.0

Revision: 3e8ca2fb781

Directory: /opt/gitlab/embedded/service/gitlab-rails

DB Adapter: PostgreSQL

DB Version: 9.6.11

URL: https://gitlab.simplecloud.co.za

HTTP Clone URL: https://gitlab.simplecloud.co.za/some-group/some-project.git

SSH Clone URL: git@gitlab.simplecloud.co.za:some-group/some-project.git

Using LDAP: no

Using Omniauth: yes

Omniauth Providers:

GitLab Shell

Version: 9.1.0

Repository storage paths:

- default: /var/opt/gitlab/git-data/repositories

GitLab Shell path: /opt/gitlab/embedded/service/gitlab-shell

Git: /opt/gitlab/embedded/bin/git

root@simplegitlab:~#

WordPress use CDN with out plugin

Content Devlivery Network (CDN) allow your web site to serve images from another domain or a sub domain. This speed up web site as your web server don’t need to serve images. Also browsers have a limit on number of parallel downloads from same domain. Having images on a differnt domain bypass this limitation of web browser.

If you use a pull type CDN or a CDN that you manually upload using some sync tool, you need to rewrite all image url to CDN url. There are several plugins available to do this. But you can easily do this with out any plugins.

Edit file

wp-content/themes/YOUR-THEME/functions.php

1	wp-content/themes/YOUR-THEME/functions.php

Add following code to end of the file.

add_filter('wp_get_attachment_image_src', 'staticize_attachment_src', null, 4);

function staticize_attachment_src($image, $attachment_id, $size, $icon) {
    if (is_array($image) && !empty($image[0])) {
        $image[0] = str_replace( 'https://www.YOUR-DOMAIN-HERE/wp-content/uploads/', 'https://cdn.YOUR-DOMAIN-HERE/wp-content/uploads/', $image[0] );
    }
    return $image;
}

add_filter('wp_get_attachment_image_src', 'staticize_attachment_src', null, 4);

function staticize_attachment_src($image, $attachment_id, $size, $icon) {

if (is_array($image) && !empty($image[0])) {

$image[0] = str_replace( 'https://www.YOUR-DOMAIN-HERE/wp-content/uploads/', 'https://cdn.YOUR-DOMAIN-HERE/wp-content/uploads/', $image[0] );

}

return $image;

}

This will replace image urls with CDN url.

Docker delete container after running

When you run a docker image, it create a container and run it. After docker container stop, container stays, so you can use it again if required.

Some times, you need to delete docker container after it is run. This is useful if your docker container is just a command line executable. In my case, docker container have ffmpeg in it, i don’t want container left over after i executed ffmpeg command.

To auto delete container after execution, use –rm option.

docker run --rm DOCKER_IMAGE

1	docker run --rm DOCKER_IMAGE

Example

docker run --rm --name ffmpeg jrottenberg/ffmpeg:3.2-ubuntu -format

1	docker run --rm --name ffmpeg jrottenberg/ffmpeg:3.2-ubuntu -format

apt force IPv4

One of my internet provider only provide IPv4 connection. When i run apt install command, it failed with error as it try to connect using IPv6.

boby@sok-01:~$ sudo apt install php7.3-curl
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  php7.3-curl
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 29.6 kB of archives.
After this operation, 123 kB of additional disk space will be used.
Err:1 http://ppa.launchpad.net/ondrej/php/ubuntu bionic/main amd64 php7.3-curl amd64 7.3.13-1+ubuntu18.04.1+deb.sury.org+1
  Could not connect to ppa.launchpad.net:80 (2001:67c:1560:8008::15). - connect (101: Network is unreachable) Could not connect to ppa.launchpad.net:80 (91.189.95.83), connection timed out
E: Failed to fetch http://ppa.launchpad.net/ondrej/php/ubuntu/pool/main/p/php7.3/php7.3-curl_7.3.13-1+ubuntu18.04.1+deb.sury.org+1_amd64.deb  Could not connect to ppa.launchpad.net:80 (2001:67c:1560:8008::15). - connect (101: Network is unreachable) Could not connect to ppa.launchpad.net:80 (91.189.95.83), connection timed out
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
boby@sok-01:~$

boby@sok-01:~$ sudo apt install php7.3-curl

Reading package lists... Done

Building dependency tree

Reading state information... Done

The following NEW packages will be installed:

php7.3-curl

0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.

Need to get 29.6 kB of archives.

After this operation, 123 kB of additional disk space will be used.

Err:1 http://ppa.launchpad.net/ondrej/php/ubuntu bionic/main amd64 php7.3-curl amd64 7.3.13-1+ubuntu18.04.1+deb.sury.org+1

Could not connect to ppa.launchpad.net:80 (2001:67c:1560:8008::15). - connect (101: Network is unreachable) Could not connect to ppa.launchpad.net:80 (91.189.95.83), connection timed out

E: Failed to fetch http://ppa.launchpad.net/ondrej/php/ubuntu/pool/main/p/php7.3/php7.3-curl_7.3.13-1+ubuntu18.04.1+deb.sury.org+1_amd64.deb Could not connect to ppa.launchpad.net:80 (2001:67c:1560:8008::15). - connect (101: Network is unreachable) Could not connect to ppa.launchpad.net:80 (91.189.95.83), connection timed out

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

boby@sok-01:~$

To force apt to use IPv4 only, edit

sudo vi /etc/apt/apt.conf.d/99-force-ipv4

1	sudo vi /etc/apt/apt.conf.d/99-force-ipv4

Add

Acquire::ForceIPv4 "true";

1	Acquire::ForceIPv4 "true";

If you want to force IPv6, add

Acquire::ForceIPv6 "true";

1	Acquire::ForceIPv6 "true";

Set tab width in vim

To set tab width in vim, run

:set tabstop=4

1	:set tabstop=4

To make it permanant, edit ~/.vimrc add

set tabstop=4

1	set tabstop=4

CentOS 7 resolv.conf make changes permanent

On rebooting CentOS 7 server, changes made to resolv.conf is lost. This is becaise one of the network interface is configured to use DNS server.

[root@server ~]# grep DNS /etc/sysconfig/network-scripts/ifcfg-*
/etc/sysconfig/network-scripts/ifcfg-eno1:DNS1="127.0.0.1"
[root@server ~]#

[root@server ~]# grep DNS /etc/sysconfig/network-scripts/ifcfg-*

/etc/sysconfig/network-scripts/ifcfg-eno1:DNS1="127.0.0.1"

[root@server ~]#

To fix, edit

vi /etc/sysconfig/network-scripts/ifcfg-eno1

1	vi /etc/sysconfig/network-scripts/ifcfg-eno1

Remove the line

DNS1="127.0.0.1"

1	DNS1="127.0.0.1"

Now NetworkManager will not modify /etc/resolv.conf file on boot.

Or you can set valid DNS servers in network config file like

[root@server ~]# cat /etc/sysconfig/network-scripts/ifcfg-eno1 | grep DNS
DNS1="1.1.1.1"
DNS2="8.8.8.8"
[root@server ~]#

[root@server ~]# cat /etc/sysconfig/network-scripts/ifcfg-eno1 | grep DNS

DNS1="1.1.1.1"

DNS2="8.8.8.8"

[root@server ~]#

If your network configuration use DHCP, set set PEERDNS=no.

BOOTPROTO=dhcp
PEERDNS=no

1 2	BOOTPROTO=dhcp PEERDNS=no

Another solution is to make file immutable with

chattr +i /etc/resolv.conf

1	chattr +i /etc/resolv.conf

Related Posts

Domain Resolver

Install Pure-FTPd on CentOS with Virtual Users

To install Pure-FTPd on CentOS, run

yum install -y pure-ftpd

1	yum install -y pure-ftpd

Edit configuration file

vi /etc/pure-ftpd/pure-ftpd.conf

1	vi /etc/pure-ftpd/pure-ftpd.conf

To disable anonymous FTP, find

NoAnonymous                  no

1	NoAnonymous no

Replace with

NoAnonymous                  yes

1	NoAnonymous yes

To enable Virtual Users, find

# PureDB                        /etc/pure-ftpd/pureftpd.pdb

1	# PureDB /etc/pure-ftpd/pureftpd.pdb

Uncomment the line.

PureDB                        /etc/pure-ftpd/pureftpd.pdb

1	PureDB /etc/pure-ftpd/pureftpd.pdb

To Allow Apache user to login via FTP, find

MinUID                      1000

1	MinUID 1000

Replace with

MinUID                      47

MinUID 47

I set MinUID value to 47, as apache user have UID/GID of 48. By setting MinUID below that apache user should be able to login.

Set pureftpd to start on Boot

systemctl enable pure-ftpd

1	systemctl enable pure-ftpd

Restart pure-ftpd

systemctl start pure-ftpd

1	systemctl start pure-ftpd

Create a Virual User

To create a virtual user, run

pure-pw useradd  USER_NAME_HERE -u apache -g apache -d /var/www/html/

1	pure-pw useradd USER_NAME_HERE -u apache -g apache -d /var/www/html/

It will ask you to enter password two times.

Now run

pure-pw mkdb
systemctl start pure-ftpd

1 2	pure-pw mkdb systemctl start pure-ftpd

Change Password of an existing Virual User

pure-pw passwd USER_NAME_HERE

1	pure-pw passwd USER_NAME_HERE

It will ask you to enter new password.

Rebuild password database and restart pure-ftpd with

pure-pw mkdb
systemctl start pure-ftpd

1 2	pure-pw mkdb systemctl start pure-ftpd

Related Posts

Install pureftpd on Ubuntu

pureftpd

Install vim from source on CentOS

To install vim from source on CentOS server, run

yum -y install  ncurses-devel
cd /usr/local/src
wget https://github.com/vim/vim/archive/master.zip	
unzip master.zip
cd vim-master/src/
./configure
make
make install

yum -y install ncurses-devel

cd /usr/local/src

wget https://github.com/vim/vim/archive/master.zip

unzip master.zip

cd vim-master/src/

./configure

make

make install

This will install latest version of vim. You can start it with command

vim

vim

To get it work with “vi” command, i removed preinstalled vim editor with command

rpm -e --nodeps  vim-minimal

1	rpm -e --nodeps vim-minimal

Now create a symlink with

ln -s /usr/local/bin/vim /bin/vi

1	ln -s /usr/local/bin/vim /bin/vi

Find all sites using a specific nameserver

To list all sites that use a specific name server, you can use the search available on web site

https://securitytrails.com/list/ns/ns1.yahoo.com

Above URL will list all domains hosted using name servers ns1.yahoo.com, replace it with whatever name servers you want to get list of sites.

Magento Change URL

Magento store web site url in table core_config_data. To see current url, in phpMyAdmin or MySQL command line, run

select * from core_config_data where path like '%base_url';

1	select * from core_config_data where path like '%base_url';

Normally this show 2 entry. If it shows more than 2 entry, it is because you have more store configured in your Magento installation. In such case, you should be careful to change correct URL.

To change URL, run

UPDATE core_config_data SET value = 'https://NEW_URL_HERE/' WHERE path = 'web/unsecure/base_url';
UPDATE core_config_data SET value = 'https://NEW_URL_HERE/' WHERE path = 'web/secure/base_url';

1 2	UPDATE core_config_data SET value = 'https://NEW_URL_HERE/' WHERE path = 'web/unsecure/base_url'; UPDATE core_config_data SET value = 'https://NEW_URL_HERE/' WHERE path = 'web/secure/base_url';

Replace https://NEW_URL_HERE/ with your new web site url.

ServerOK

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