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linux - What is the thundering herd problem and how can a race . . . The thundering herd problem is that when something happens, typically a lock being released or an I O input event completing, lots of processes which have been waiting will resume One will be choosen and all the rest will typically resume waiting on the lock or I O event
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
Correct locking in shell scripts? - Unix Linux Stack Exchange But 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
What is usr local bin? - Unix Linux Stack Exchange Before 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
Adding a self-signed certificate to the trusted list The simple answer to this is that pretty much each application will handle it differently Also OpenSSL and GNUTLS (the most widely used certificate processing libraries used to handle signed certificates) behave differently in their treatment of certs which also complicates the issue
How to replace quotation marks in a file with sed? Two tips in Bourne-like shells: You can't escape a single quote within a string quoted with single quotes¹ So you have to close the quote, add an escaped quote, then open the quotes again