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vblog vblog a blog about it stuff ;) foreground and background jobs – linux foreground and background jobs – linux 27. january 2017 vince a tool that is for sure not used enough is fg / bg. example: did you ever start editing a file and suddenly remembered that you needed to copy the values of the previous command? well this take care of this problem and many others! first of all, executing a command / job in background when in a shell is as simple as adding an “&” at the end of the command: watch -d ls -l & another way to do this is by using the “bg” command, or by pressing “ctrl+z”: watch -d ls -l bg in order to see all background running jobs use the “jobs” command: jobs [1] + suspended (signal) nano ca.crt and to bring one of them back to foreground, or use “ctrl+z”: fg %1 where “%1” is the number of the job. using this syntax you can also kill jobs: kill %1 this is a very simple feature which can make your live easier if you learn to use it. cheers, vincent what driver is my nic using? what driver is my nic using? 11. november 2016 vince hello people, in this small blog post i wanted to show you a nice script to see which drivers are used by the network interfaces of a linux machine. #!/bin/bash for f in /sys/class/net/*; do dev=$(basename $f) driver=$(readlink $f/device/driver/module) if [ $driver ]; then driver=$(basename $driver) fi addr=$(cat $f/address) operstate=$(cat $f/operstate) printf "%10s [%s]: %10s (%s)\n" "$dev" "$addr" "$driver" "$operstate" done i find this very useful when you need to find out if your interface is running at 10gb or only 1gb. the output looks like this: eno1 [2c:60:0c:da:7b:fc]: igb (up) eno1.361 [2c:60:0c:da:7b:fc]: (up) eno1.362 [2c:60:0c:da:7b:fc]: (up) ens255f0 [2c:60:0c:f1:e6:5b]: ixgbe (up) so you can see that ens255f0 is a 10gb interface and en1 is only 1 gb. this script has not been written by me but by an stackexchange user, all credits goes to him. for reference here’s the link to the stackexchange question . bests, dov working with systemd working with systemd 7. november 2016 vince hi there, in this small post we are going to see how systemd works and what are the difference from the old init.d system. a problem i recently had to solve was a mongodb instance which was starting with the wrong arguments. to debug it i used the following commands: vdo@ubuntu:/lib/systemd/system$ systemctl status mongod.service - mongod.service - high-performance, schema-free document-oriented database loaded: loaded (/lib/systemd/system/mongod.service; enabled; vendor preset: enabled) active: failed (result: exit-code) since fri 2016-11-04 14:24:21 cet; 3 days ago main pid: 2870 (code=exited, status=100) vdo@ubuntu:/lib/systemd/system$ systemctl status mongodb - mongodb.service - lsb: an object/document-oriented database loaded: loaded (/etc/init.d/mongodb; bad; vendor preset: enabled) active: active (running) since mon 2016-11-07 15:14:44 cet; 1min 23s ago process: 16456 execstop=/etc/init.d/mongodb stop (code=exited, status=0/success) process: 16474 execstart=/etc/init.d/mongodb start (code=exited, status=0/success) cgroup: /system.slice/mongodb.service +-16486 /usr/bin/mongod --config /etc/mongodb.conf so basically i had mongod and mongodb. but which was i suppesed to use and how should i start it? by googling around i found that mongodb was renamed to mongod after version 2.4. now that i was sure of the version i was supposed to use i could then enable the correct start script. if you have no startup script you can create one follwing this template: [unit] description=high-performance, schema-free document-oriented database after=network.target documentation=https://docs.mongodb.org/manual [service] user=mongodb group=mongodb execstart=/usr/bin/mongod --replset singlenoderepl --quiet --config /etc/mongodb.conf [install] wantedby=multi-user.target to enable the script: sudo systemctl enable mongod.service this command creates a symlink to your service file: mongod.service -> /lib/systemd/system/mongod.service installing zsh and oh-my-zsh with my favorite theme: agnoster! installing zsh and oh-my-zsh with my favorite theme: agnoster! 29. august 2016 vince hi guys, in this small post i’m showing you how to install the zsh shell interpreter and one of my favorite themes agnoster. firstly, the terminal of choice for this article (and also my personal choice) is terminator. you can find it in any repository for most distributions. in ubuntu, these simple commands install terminator: sudo apt-get install -y terminator next, to install zsh run the following command: sudo apt-get install -y zsh once installed, the default terminal is automatically changed to zsh. if this is not the case, use the following commands to set it as default: #first check the location which zsh /bin/zsh #now change shell from /bin/bash to /bin/zsh chsh password: changing the login shell for root enter the new value, or press enter for the default login shell [/bin/bash]: /bin/zsh now if you restart your terminator instance it should open using zsh! it’s now time to install oh-my-zsh. oh-my-zsh is a github project framwork for managing your zsh configuration. it includes 180+ optional plugins and more than 120 themes to spice up your journey. for complete information, please visit the official git home page : robbyrussell – oh-my-zsh . to install oh-my-zsh run the following command: wget https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh -o - | sh as i’ve mentioned, my favourite theme is “agnoster”. you can check out other themes at this url . to set up oh-my-zsh to use the agnoster theme just edit the ~/.zshrc configuration file (unique for each user) and add the name of the theme to the zsh_theme variable: zsh_theme="agnoster" once changed the theme, specific fonts have to be installed in order to fully support it: #clone repo git clone https://github.com/powerline/fonts.git cd fonts #start install script sudo ./install.sh and now, open terminator and go under the preference menu (right-click -> preferences). under profiles you should find the general tab with the possibility to change the font. replicate the one set up in the image here below: the last step is to set up the syntax highlighting plugin: #move to zsh plugin folder cd ~/.oh-my-zsh/plugins #clone repo git clone https://github.com/zsh-users/zsh-syntax-highlighting # enable plugin in zshrc nano ~/.zshrc #find the plugin and add syntax +plugins=(git zsh-syntax-highlighting) #source modif source .zshrc and there you go. end result should look something like this: enjoy! iptables – add, remove and backup your rules! iptables – add, remove and backup your rules! 21. july 2016 vince hi, today, in this post, we are going to talk about iptables. it’s user-space application that allows to configure the tables provided by the linux kernel firewall (implemented as different netfilter modules) and the chains and rules it stores. the first basic command to learn is the one allowing to list all rules in all chains, “iptables -l” or “iptables –list”. in iptables by default three different chain exist: input, forward and output. each one of these chains is related to an “action”, input handles the rules for input connections and so on. empty iptbales rules listing: chain input (policy accept) target prot opt source destination chain forward (policy accept) target prot opt source destination chain output (policy accept) target prot opt source destination now let’s try to add a simple rule allowing ssh access only form a certain ip range: iptables -a input -s 10.0.0.0/8 -p tcp -m multiport --dports 22 -m comment --comment "010 ssh" -m state --state new -j accept the meaning of each option is described here below: -a : append the rule to a chain, in this case to the input chain -s : address/mask source specification (the source of the connection), in this case only 10.x.x.x addresses are allowed to use ssh -p : the connection protocol used, in this case tcp -m multiport

URL analysis for vincenzo-do.ch

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http://vincenzo-do.ch/#how_does_fuel_work?
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  NS336.HOSTSTAR.CH 148.251.244.181

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