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Bookmark or Share- What is /usr/local/bin? - Unix & Linux Stack ExchangeBefore today, I've used the terminal to a limited extent of moving in and out of directories and changing the dates of files using the touch command. I had realised the full extent of the terminal ...
- Automatically run commands over SSH on many serversThere is a list of IP addresses in a .txt file, ex.: 1.1.1.1 2.2.2.2 3.3.3.3 Behind every IP address there is a server, and on every server there is an sshd running on port 22. Not every server i...
- How to avoid conflicts between dnsmasq and systemd-resolved?I recently installed dnsmasq to act as DNS Server for my local network. dnsmasq listens on port 53 which is already in use by the local DNS stub listener from systemd-resolved.
- Correct locking in shell scripts? - Unix & Linux Stack ExchangeBut things can go wrong - for example when the lockfile is on a NFS server - that hangs. In that case several cron jobs can block on line 3 and queue up. If the NFS server is active again then you have thundering herd of parallel running jobs. Searching on the web I found the tool lockrun which seems like a good solution to that problem. With ...
- Cron job, random start but within timeframe"It's an odd requirement." I disagree. Many applications, especially those that need to periodically check in with a server (such as package managers or configuration management clients), need to splay their execution times in order to avoid a thundering herd situation.
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