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Posts Categorized / Linux

  • Mar 05 / 2017
  • 0

Use wget/curl behind a proxy

If your machine is behind a proxy, you probably configured your browser for going through the proxy to reach Internet. But what about command line with curl and wget?

If you want to add the proxy temporarily for some few installations for example, just type (by replacing URL and port with yours):

If you want to make the changes globally and keep it after a restart (or a new login), you can:

  • Add those lines in ~/.wgetrc to make it available only for wget and for the current user
  • Add those lines in /etc/environment to make it work for either curl/wget or any http relevant command:

If you need authentication, you can simply include username and password in your connection string like:

  • Feb 24 / 2017
  • 0

Reset root password on Linux

Who never forgot a root password on a running machine that you can’t reinstall totally?

Most of the linux distributions do have a recovery partition that you can use for that on startup (I won’t detail this here). But if you don’t have this partition, you can still reset it using generic commands thanks to grub capabilities.

Here is the procedure for resetting root password on most of the linux distros using GRUB:

  1. Reboot the machine
  2. When you get the GRUB menu, go to edit page by pressing e when highlighting the correct line you want to modify (generally it’s the first one, no need to change)
  3. Go to the kernel line and enter again for editing
  4. Remove the quiet word at the end of the line and replace with that:
  5. Press enter to validate your changes
  6. Press b to boot (that way, changes will only be temporary)
  7. You’re now getting a root bash prompt for your machine
  8. The root filesystem is mounted as readonly by default, you have to mount it as read/write by typing
  9. Use the passwd command to create a new root password (pay attention to keyboard layout that can be different!)
  10. Reboot and log into your server with your freshly created password

You should now be able to connect perfectly to your server with your new password!

  • Jan 26 / 2017
  • 0

Apache Directory Listing – Download

Some Apache servers do activate the DirectoryIndex so you can easily go through the directories listing over HTTP and download some files. It’ s often used for giving possibility to people to download multiple releases for a package/software.
But in some cases, it can be useful to download the content of a full tree view.

This can be done by using a simple tool available by default on Linux (can be downloaded on Windows/Mac): wget

Let’s take an example!

Without proxy

We want to download all the files on https://pkg.mywebsite.eu/releases/ which contains all the latest releases of our preferred soft.

Here, we are using many options to say to wget what we want to do:

  • -rTurn on recursive retrieving (max 5)
  • -np : Do not ever ascend to the parent directory when retrieving recursively
  • -nH –cut-dirs=1 : Disable generation of host-prefixed directories, and remove 1 level (here, remove “pkg.mywebsite.eu” and create a “releases” dir)
  • -l 15 Change default depth for downloading to 15 levels (default is 5)
  • -R index.html : Specify comma-separated lists of file name suffixes or patterns to reject

With proxy

Let’s now add a complexity, this server is only available through a proxy to protect the content. The proxy is available on your localhost ( on port 3128 (default port for Squid Proxy):

Here, we just added 2 options to be able to send exactly the same request but using proxy:

  • -e use_proxy=yesExecute command to enable proxy
  • -e http_proxy= command to give URL to use for HTTP proxy


  • Dec 07 / 2016
  • 0

Nagios plugin – Error “No such file or directory”

When trying to execute a nagios plugin, you’re getting this error:

But when checking further, the file does exist:

This can be due to some 32 bit libc libraries missing. To fix that, you will have to install the 32-bit shared libraries for AMD64 by installing this package:

And now, you can try again, error should have gone away!

  • Nov 24 / 2016
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NRPE – Enable command args (Jessie, …)

With recent versions of NRPE server, the possibility to enable command args has been disabled.

For example, on a Debian Jessie, you can get this kind of error on console:

and in logs:

!WARNING! This change can lead to security issue, this is why it has been disabled by default. You have to double check your servers can’t be reached from anywhere with NRPE commands (to avoid execution of unwanted or malicious code).

Once you’re sure there’s no security breach in your infra, you can go on with the installation of source:

Then, you’ll have to change the rules defined in the rules file:

You must add this line –enable-command-args after –libdir=/usr/lib/nagios.
You should so get something like

Finally, you can compile your new configuration and install it:

Ensure you set the value for dont_blame_nrpe in /etc/nagios/nrpe.cfg (this is the default path, it can be different depending on your installation).

And here you go, you can now restart your NRPE server and send any nrpe commands.

  • Nov 21 / 2016
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Apache – mod_auth compatibility for 2.2 and 2.4

Since Apache 2.4, mod_auth changed and some directive like

that have been replaced with

If you want to automatically handle same configuration for multiple servers where different versions of Apache are installed, you can use this trick:

Thanks to that change, your configuration will be working whatever version of Apache you’re using.

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