Databases, Systems & Networks

Comment rendre la commande ssh-copy-id disponible sur Mac OS X

Si vous avez tenté d’utiliser la commande ssh-copy-id sur Mac OS X, vous avez dû vous rendre compte que, même si openssh est installé nativement, cette commande n’est pas disponible.

Heureusement, cette commande est un simple script qu’il suffit de copier au bon endroit, de lui donner les bons droits et SURPRISE la commande est disponible.

Et comme je suis sympa, eh bien je vous donne tout ça. 😉 Pour commencer le script ssh-copy-id

Ensuite, la méthodologie à suivre pour le mettre en place:

• Télécharger le fichier
• Déplacer le fichier dans le répertoire /usr/bin
• Lui donner les droits nécessaires

$ chmod 755 /usr/bin/ssh-copy-id

Edit

Si vous utilisez homebrew, il existe un package pour faire la même chose :
brew install ssh-copy-id

Source: Mikael Randy

Source: nixCraft

How can I mount remote directory with ssh on a Linux bases system? How do I use SSHFS to mount remote file systems over SSH on a Ubuntu or Debian/RHEL/CentOS/Arch Linux system?

SSH is a secure protocol and you can use it to mount a directory on a remote server or local laptop with the help of the SSHF service. With SSHFS you can mount remote server file system to your local

More on SSHFS

sshfs is a filesystem based on the SSH file transfer protocol. It is used on a client system i.e. you need to install sshfs package on your local computer/laptop powered by CentOS/RHEL/Ubuntu/Debian/Arch Linux. No need to install anything on server (server1.cyberciti.biz). You only need an openssh server installed on server side. Our sample setup:

Lire la suite…

Source: nixCraft

Both Debian and Ubuntu Linux provides a number of package management tools. This article summaries package management command along with it usage and examples for you.

• apt-get : APT is acronym for Advanced Package Tool. It supports installing packages over internet using ftp or http protocols. You can also upgrade all packages in a single operations, which makes it even more attractive.
• dpkg : Debian packaging tool which can be use to install, query, uninstall packages.

Gui tools: You can also try GUI based or high level interface to the Debian GNU/Linux package system. Following list summaries them:

• aptitude: It is a text-based interface to the Debian GNU/Linux package system.
• synaptic: GUI front end for APT

Red hat Linux package names generally end in .rpm, similarly Debian package names end in .deb, for example:

apache_1.3.31-6_i386.deb

Where,

1. apache : Package name
2. 1.3.31-6 : Version number
3. i386 : Hardware Platform on which this package will run (i386 == intel x86 based system)
4. .deb : Extension that suggest it is a Debian package

Remember, whenever I refer .deb file it signifies complete file name, and whenever I refer package name it must be first part of .deb file. For example, when I refer to a package sudo it means sudo only and not the .deb file i.e. sudo_1.6.7p5-2_i386.deb. You can find out debian package name with the following command:

apt-cache search {package-name}
apt-cache search apache

Finally, most of the actions listed in this post are written with the assumption that they will be executed by the root user running the bash or any other modern shell. Lire la suite…

Source: nixCraft

I setup a web-server. I need to grant a user ssh access but I do not trust users. How can I limit user session to a specific directory such as /home/httpd/$USERNAME? How do I set up a ssh chroort jail on a Linux operating systems?

You can interactive shell with special root directory on a Linux or Unix-like systems. You can set the pathname (such as /home/httpd/foo) of a directory to chroot to after authentication. All components of the pathname must be root owned directories that are not writable by any other user or group. After the chroot, sshd changes the working directory to the user’s home directory.

Say hello to ChrootDirectory directive

From the sshd_config man page:

The ChrootDirectory must contain the necessary files and directo ries to support the user’s session. For an interactive session this requires at least a shell, typically sh(1), and basic /dev nodes such as null(4), zero(4), stdin(4), stdout(4), stderr(4), arandom(4) and tty(4) devices. For file transfer sessions using « sftp », no additional configuration of the environment is necessary if the in-process sftp server is used, though sessions which use logging do require /dev/log inside the chroot directory.

Lire la suite…

Source: nixCraft

How to execute script on the last day of a month on Linux or Unix bash shell? How do I run a disk usage or custom reporting shell/perl/python script on the last day of a month on a Linux or Unix-like systems?

You need to use the date command to find out whether tomorrow is the first day of the next month. If it is true, you can run your script.

Say hello to TZ variable

TZ is time zone environment variable on Linux or Unix-like systems. The TZ environment variable tells functions such as the ctime(3) family and programs like date what the time zone and daylight saving rule is. For example, Greenwich Mean Time can be defined as follows:

TZ='GMT'

You can set TZ as follows to get tomorrow from the current date (+%d):
TZ=GMT-24 date +%d

Lire la suite…