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This command telnet and and looks for a line starting with "SSH" - works for OpenSSH since the SSH banner is something like "SSH-2.0-OpenSSH_6.0p1 Debian-4+deb7u3". Then it triggers an action accordingly.
It can be packed as a script file to echo 0/1 indicating the SSH service availability:
if [[ "$(sleep 1 | telnet -c <host> <port> 2>&1 | grep '^SSH')" == SSH* ]]; then echo 1; else echo 0; fi;
Trigger an action when server is UP (using &&):
[[ "$(sleep 1 | telnet -c <host> <port> 2>&1 | grep '^SSH')" == SSH* ]] && <command when up>
Trigger an action when server is DOWN (using ||):
[[ "$(sleep 1 | telnet -c <host> <port> 2>&1 | grep '^SSH')" == SSH* ]] || <command when down>
The files are automatically uncompressed when they reach the destination machine. This is a fast way to backup your server to your local computer while it's running (shutting down services is recommended).
A file named "exclude.txt" is needed at /tmp/ containing the following :
Client ~$ ncat --ssl localhost 9876
Change localhost to the correct ip address.
Alternative for machines without ssh-copy-id
Copies the complete root-dir of a linux server to another one, where the new harddisks formated and mountet. Very useful to migrate a root-server to another one.
- Where $URL is the URL of the file.
- Replace the $2 by $3 at the end to get a human-readable size.
Credits to svanberg @ ArchLinux forums for original idea.
Edit: Replaced command with better version by FRUiT. (removed unnecessary grep)
Run local scripts on remote server. "-T Disable pseudo-tty allocation"
GoAccess is an open source real-time Apache web log analyzer and interactive viewer that runs in a terminal in *nix systems. It provides fast and valuable HTTP statistics for system administrators that require a visual server report on the fly. http://goaccess.prosoftcorp.com/
This is like ping -a, but it does the opposite. It alerts you if the network is down, not up. Note that the beep will be from the speaker on the server, not from your terminal.
Once a second, this script checks if the Internet is accessible and beeps if it is not. I define the Net as being "UP", if I can ping Google's public DNS server (188.8.131.52), but of course you could pick a different static IP address. I redirect the beep to /dev/console so that I can run this in the background from /etc/rc.local. Of course, doing that requires that the script is run by a UID or GID that has write permissions to /dev/console (usually only root).
Question: I am not sure if the -W1 flag works under BSD. I have only tested this under GNU/Linux using ping from iputils. If anybody knows how portable -W is, please post a comment.
Prerequisites: module Pod::Webserver installed. You can install it typing:
sudo perl -MCPAN -e 'install Pod::Webserver'
You can replace elinks with your fav browser. For FF:
podwebserver& sleep 2; firefox -remote 'openurl( http://127.0.0.1:8020/, new-tab )'
If you have Firefox open, this will pop-up the index web in a new tab.
I must monitorize a couple of ftp servers every morning WITHOUT a port-scanner
Instead of ftp'ing on 100 ftp servers manually to test their status I use this loop.
It might be adaptable to other services, however it may require a 'logout' string instead of 'quit'.
The file ftps.txt contains the full list of ftp servers to monitorize.
The execution of this command will install a LAMP server (Linux, Apache, MySQL and PHP) in a Debian based distribution. For example, in Ubuntu.
This command will start a simple SMTP server listening on port 1025 of localhost. This server simply prints to standard output all email headers and the email body.