PHP sending email via gmail

apt-get install msmtp
add gmail account to /etc/msmtp
vi php.ini
 
sendmail_path = "/usr/bin/msmtp --logfile /var/log/msmtp_php/msmtp-php-cli.log -a gmail -t"

Git link local branch to remote

git branch --set-upstream-to=origin/branchname

Ssh key generation and folder files explain

Ssh protocol version 1 key generation.

ssh-keygen

When asked for a “passphrase”, we won’t enter one. Just press enter twice.
It will generate 2 files:

/home/user/.ssh/id_rsa.pub
/home/user/.ssh/id_rsa

2. Copy id_rsa.pub to the remove host

scp id_rsa.pub user@hostname:/home/user/.ssh/id_rsa.pub

or

ssh-copy-id -i .ssh/id_rsa.pub user@hostname

3. Login to remote host and add to authorized_keys file

ssh hostname -v
cd /home/user/.ssh
cat id_rsa.pub >> authorized_keys
chown user /home/user/.ssh/authorized_keys
chgrp user /home/user/.ssh/authorized_keys

Ssh protocol version 2 key generation.

ssh-keygen -t dsa

When asked for a “passphrase”, we won’t enter one. Just press enter twice.
It will generate 2 files:

/home/user/.ssh/id_dsa.pub
/home/user/.ssh/id_dsa

2. Copy id_dsa.pub to the remove host

scp id_dsa.pub user@hostname:/home/user/.ssh/id_dsa.pub

or

ssh-copy-id -i .ssh/id_rsa.pub user@hostname

3. Login to remote host and add to authorized_keys2 file

ssh hostname -v
cd /home/user/.ssh
cat id_dsa.pub >> authorized_keys2
chown user /home/user/.ssh/authorized_keys2
chgrp user /home/user/.ssh/authorized_keys2

Web server production and prerelease environments

ln -s /var/www /var/www.prod
 
ln -s /var/www2 /var/www.prerelease

Backup mysql configs and database

sudo tar cvfvz /backup/mysql_conf.tgz /etc/mysql
sudo sh -c 'mysqldump -u root -p -A --events > /backup/backup_db.sql'
sudo tar cvfvz /backup/mysql_data.tgz /var/lib/mysql

Mysql create new database and user

CREATE DATABASE testdatabase;
 
CREATE USER 'testuser'@'localhost' IDENTIFIED BY 'testpassword';
 
GRANT ALL PRIVILEGES ON testdatabase.* TO 'testuser'@'localhost';

Find programs that listens on network ports/sockets

sudo netstat -peanut

Linux adding a new user

useradd -d /home/testuser -m testuser

Fiding domain hosting from root servers

Step 1:

dig +norec @a.root-servers.net. yourdomain.com

Result: Returns list of webservers where more information available. one of them for example is localwebserver.com

Step 2:

dig +norec @localwebserver.com. yourdomain.com

git compare branches

git diff master 0.2
 
git diff 0.1 0.2