Ubuntu Port forwarding

Port forwarding

sudo iptables -t nat -I PREROUTING -p tcp -d 192.168.1.106 --dport 9000 -j DNAT --to-destination 10.0.2.129:9000
sudo iptables -t nat -I PREROUTING -p tcp -d 192.168.1.106 --dport 9090 -j DNAT --to-destination 10.0.2.129:9090
sudo iptables -t nat -I PREROUTING -p tcp -d 192.168.1.106 --dport 50070 -j DNAT --to-destination 10.0.2.129:50070
sudo iptables -I FORWARD -m state -d 10.0.2.0/24 --state NEW,RELATED,ESTABLISHED -j ACCEPT

Systemd Boot Manager

Installation

# add-apt-repository ppa:pitti/systemd
# apt-get update
# apt-get install systemd libpam-systemd systemd-ui

Boot loader configuration

Edit /etc/default/grub :

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash init=/lib/systemd/systemd"

*** For an emergency boot without any services use
init=/lib/systemd/systemd systemd.unit=emergency.service


*** Previous Ubuntu use upstart like
init=/sbin/upstart

After any modifies then
# update-grub

Controlling service after booted

systemctl list-units - List all units (where unit is the term for a job/service)
systemctl start [NAME...] - Start (activate) one or more units
systemctl stop [NAME...] - Stop (deactivate) one or more units
systemctl enable [NAME...] - Enable one or more unit files
systemctl disable [NAME...] - Disable one or more unit files
systemctl reboot - Shut down and reboot the system
systemctl list-dependencies [NAME...] - Lists all dependency of service

Remote file system mount after networking ready

Old style use /etc/fstab  but can not check services dependency.

Create file /lib/systemd/system named <mount-unit-name>.mount and has a content

[Unit]
Description=<mountpoint>
Wants=network.target statd.service   // Network Status Monitor service
After=network.target statd.service

[Mount]
What=<server>:<share>
Where=<mountpoint>
Type=nfs
StandardOutput=syslog
StandardError=syslog

Where

• <mount-unit-name> = Remote shared directory like "/usr/local" then file name is "user-local.mount"
• <mountpoint>  = Local mount point
• <server:share> = same manner in /etc/fstab

Ubuntu fix broken package

For 12.04 and newer:


You can delete the lock file with the following command:

sudo rm /var/lib/apt/lists/lock

You may also need to delete the lock file in the cache directory

sudo rm /var/cache/apt/archives/lock