The file ~/.bash_history holds the history.
To clear the bash history completely on the server, open terminal and type:
cat /dev/null > ~/.bash_history && history -c && exit
Quick Note: Clear bash history completely
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Tag Archives: ubuntu
Suricata rule management using Oinkmaster
It is possible to download and install rules manually, but there is a much easier and quicker way to do so. There are special programs which you can use for downloading and installing rules. For example, Pulled Pork and Oinkmaster. Here I’m going to show how to install & use Oinkmaster.
To install Oinkmaster, enter:
sudo apt-get install oinkmaster
There are several rulesets available. There are Emerging Threats (ET), ET Pro and VRT. In this example we are using ET Free edition.
Oinkmaster need to know where these rules can be found. These rules can be found at:
http://rules.emergingthreats.net/open/suricata/emerging.rules.tar.gz
To configure your Oinkmaster rules location, open oinkmaster.conf and add the link/url as below:
sudo nano /etc/oinkmaster.conf
Then add this line below:
url = http://rules.emergingthreats.net/open/suricata/emerging.rules.tar.gz
In the new rules directory, a file named classification.config and reference.config can be found. The directories of both need to be added into suricata.yaml file. Do so by entering as below:
sudo nano /etc/suricata/suricata.yaml
Add this line below:
classification-file: /etc/suricata/rules/classification.config
reference-config-file: /etc/suricata/rules/reference.config
Let’s try run the Oinkmaster:
sudo oinkmaster -C /etc/oinkmaster.conf -o /etc/suricata/rules
The rules in locate at /etc/suricata/rules.
- https://redmine.openinfosecfoundation.org/projects/suricata/wiki/Rule_Management_with_Oinkmaster
- https://web.nsrc.org/workshops/2015/pacnog17-ws/raw-attachment/wiki/Track2Agenda/ex-suricata-rules.htm
Configuring proxy for APT in Ubuntu
Recently, I have a problem where when I tried to update Ubuntu package via apt-get, it shows HTTP 401 proxy error related.
Just a note, I’m running VM using my office network which has an enterprise web proxy servers.
From this site;
APT configuration file method
This method uses the apt.conf file which is found in your /etc/apt/ directory. This method is useful if you only want apt-get (and not other applications) to use a http-proxy permanently.
On some installations there will be no apt-conf file set up. This procedure will either edit an existing apt-conf file or create a new apt-conf file.
gksudo gedit /etc/apt/apt.conf
Add this line to your /etc/apt/apt.conf file (substitute your details for yourproxyaddress and proxyport).
Acquire::http::Proxy “http://username:[email protected]:proxyport”;
Save the apt.conf file.
References:
- http://askubuntu.com/questions/257290/configure-proxy-for-apt
- http://askubuntu.com/questions/543616/why-does-add-apt-repository-now-fail-to-retrieve-keys-behind-my-proxy-server-bu
Fix Locale problem on Ubuntu
Recently, I saw this kind or error quite frequent. At first I thought that it was nothing.
But eventually, it’s kinda bothering me when I see the error message :p
Jul 6 15:18:01 lel CRON[25571]: pam_env(cron:session): Unable to open env file: /etc/default/locale: No such file or directory
Jul 6 15:31:50 lel sshd[29217]: pam_env(sshd:session): Unable to open env file: /etc/default/locale: No such file or directory
So, here is the solution to solve this problem.
First, run this command:
sudo update-locale LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8
It updates /etc/default/locale with provided values.
If you see the /etc/default/locale file, it shows something like this:
# File generated by update-locale
LANG=en_US.UTF-8
LC_ALL=en_US.UTF-8
If the problem still occur, maybe you can try this first before running the command above again:
sudo locale-gen en_US.UTF-8
sudo dpkg-reconfigure locales
Credit:
http://askubuntu.com/questions/162391/how-do-i-fix-my-locale-issue/505424#505424
SNMP Cannot Find Module on Ubuntu 14.04
If you encounter error something like this:
Cannot find module (SNMPv2-MIB): At line 0 in (none)
Cannot find module (SNMPv2-SMI): At line 0 in (none)
Cannot find module (SNMP-NOTIFICATION-MIB): At line 0 in (none)
Cannot find module (SNMPv2-TM): At line 0 in (none)
Then, where are in the same path. Path where we searching for the answers. XD
So, here is the solution to solve this error.
First, edit this sources.list file:
sudo vi /etc/apt/sources.list
add this line to the end of file:
deb http://fr.archive.ubuntu.com/ubuntu precise main multiverse
:w to save and :q to exit vi editor
Then, install this packages:
sudo apt-get install snmpd snmp-mibs-downloader
And then run this:
sudo download-mibs
Voila! Done. Hope it helps. 🙂
Ubuntu – Authentication token manipulation error
Recently, I forgot my “root” password for my Ubuntu (duh!). So I try attempting to change my “root” password by selecting recovery mode on the grub menu and dropped into a root shell prompt.
Everything works perfect until I try to change the password. The picture above is what I get when i try to change the password. 🙁
So, to solve this, just run this on the prompt:
mount -rw -o remount /
Anddddd… Walla! Try to reset the password again and it works! 🙂
Hash sum mismatch error on Ubuntu
I think most of you will encounter with this kind of problem if you are using the previous version of Ubuntu.
W: Failed to fetch gzip:/var/lib/apt/lists/partial/us.archive.ubuntu.com_ubuntu_dists_natty_main_source_Sources Hash Sum mismatch,
E: Some index files failed to download. They have been ignored, or old ones used instead.
The solution is to remove the content of /var/lib/apt/lists directory:
sudo rm /var/lib/apt/lists/*
then run:
sudo apt-get update
Credit to askubuntu.com
Disable IPv6 on Ubuntu
If you want to disable IPv6 on your server, below is the step to do it.
- Edit this file:
nano /etc/sysctl.conf
- Add these lines to the bottom of the file:
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
- Run this command on your terminal:
sudo sysctl -p
Done!
Enable graphical root login on ubuntu 12.04
In Ubuntu, user “root” won’t show up as an options to login, which you need to adjust the Ubuntu to allow login as “root”.
Run this command below in your terminal (as normal user with sudo):
sudo passwd root
sudo sh -c 'echo "greeter-show-manual-login=true" >> /etc/lightdm/lightdm.conf'
Reboot and then you should be able to login as root using graphical user login.
Restore grub without live CD on Linux
If you start your Ubuntu and it display a grub shell to you, you can run this command below to fix it:
grub-rescue> prompt
ls
set prefix=(hdX,Y)/boot/grub
set root=(hdX,Y)
set
ls /boot
insmod /boot/grub/linux.mod
linux /vmlinuz root=/dev/sdXY ro
initrd /initrd.img
boot
* Ensure that you entered correct partition (e.g. hd0,1) for hdX,Y. If not, than your grub will be messed.
References :
http://superuser.com/questions/181733/how-can-i-restore-grub-without-a-live-cd1
http://www.linux.com/learn/tutorials/776643-how-to-rescue-a-non-booting-grub-2-on-linux