The history of memory usage for the day can be found by using the “sar” command. The command will show you the current RAM and swap usages in MB. Total used free shared buff/cache available You can use the command “free” to find the current memory usage in the server. The log tells us that the kernel has terminated a php-cgi process with process ID 48305 and out of memory score 21.Ĭheck the current memory usage in the server.
You can confirm the memory insufficiency if you receive a log entry like the one above. Mar 1 01:24:08 srv kernel: Out of memory: Kill process 48318 (php-cgi) score 21 or sacrifice child
Mar 1 01:24:05 srv kernel: Out of memory: Kill process 48305 (php-cgi) score 21 or sacrifice child You can use the below grep command to search in all log files in /var/log/ location for an out of memory error. Linux kernel manages the server memory by killing tasks/processes based on some process criteria and release the memory footprint occupied by the killed process.Ī log entry will be generated for every such process terminated by the kernel and the logs are usually available in /var/log/ location. You may not notice any issues with the memory availability at the time of your investigation however there is a possibility for such an incident on a previous time stamp. Identifying the “Out of Memory” scenario.
Linux is a very efficient operating system designed to work on all available resources and it offers us some possibility for adjusting the OS configuration parameters which control the server memory usage.īelow is a discussion about finding the memory leaks in your server and to guide you to better manage the assigned server memory. However, it is possible for any server to over consume the allocated resources at times of high traffic or from high demand. Certain minimum resource requirements should be satisfied depending on the running applications in the server for it to deliver the best performance. There are situations where your server shows unintended behaviors like a slow response from websites, failures with services, inability to start applications, server crashes etc.
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