Making a service autostart on Ubuntu, Debian, Oralce Linux, CentOs and Red Hat (Fedora and RHEL)

For RedHat based distributions (CentOS, Oracle Linux, Fedora) execute (as root):

chkconfig servicename on


For Debian based distributions (Ubuntu) execute (as root):

update-rc.d servicename defaults

Provided by: Forthscale systems, Linux support team

Setting up Amazon AWS EC2 ftp server with Linux and VSFTP:

Install vsftp (example for Ubuntu / Debian)

apt-get -y install vsftpd

Edit configuration file (in our example with local authentication and no guest user)

vi /etc/vsftpd.conf

write_enable=YES
anonymous_enable=NO
local_umask=022
local_enable=YES

#to add passive ftp:
pasv_enable=YES
pasv_max_port=12100
pasv_min_port=12000
port_enable=YES
pasv_address="your external instance ip or address"

and open inbound port range 20-21 and 12000-12100 in your security groups

Provided by: ForthScale systems, scalable infrastructure experts

Debian / Ubuntu: purge removed packages with apt

Removing packages with aptitude or apt-get keeps some configuration and temp files on disk.
to purge them (to get rid of these configuration files) execute:

dpkg -l |awk ‘/^rc/ {print $2}’ |xargs sudo dpkg --purge

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Provided by: ForthScale systems, scalable infrastructure experts

fixing E: Archive directory /var/cache/apt/archives/

During apt-get install of a package you might receive message :
E: Archive directory /var/cache/apt/archives/

to fix it you need to create a directory and repair deb packages database:

mkdir -p /var/cache/apt/archives/partial
apt-get autoclean

you should get response output similar to:
Reading package lists... Done
Building dependency tree
Reading state information... Done

then feel free to install you package with apt-get or aptitude


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List open ports and listening services in Linux

To list open network ports (sockets) and the processes that run them on any Linux distribution use netstat. You might need to install it via yum / apt-get.
Syntax:
netstat -lnptu

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Provided by: SiQ systems, Cloud experts

MySQL and debian-sys-maint account

If for some reason your debian-sys-maint account is unset in MySQL, during MySQL start you will have connect to server error. You might need to set this account in the MySQL server itself.
cat /etc/mysql/debian.cnf to get the password value from the file.
Then connect to the DB
mysql -u root -p
and execute:
GRANT ALL PRIVILEGES ON *.* TO 'debian-sys-maint'@'localhost' IDENTIFIED BY 'YOUR_PASSWORD' WITH GRANT OPTION