I was having trouble with a webserver this week, which I'd just set up for a client. When it went live, it seemed OK initially, but when we left it overnight it curled up its toes and died. It was so dead that I couldn't even ssh in to reboot it, so we had to do a remote reboot. Crunch.<\/p>\n
Anyway, on getting it back up, I poked around in the logs and found that it was running out of memory, which it really shouldn't do given that it was a fairly low load on the webserver, and only apache, mysql and php were running on it. I looked around the Interwebs and found an excellent resource called Troubleshooting Memory Usage<\/a>, which gave me some pointers about how to rein in apache and stop it from eating up memory so quickly. Thanks!<\/p>\n Anyway on the page was a script for summarising memory usage, which I thought was a good idea, so i grabbed that one and adapted it to my own purposes. I thought I'd make the results available here, so feel free to grab it and adapt it to your own needs.<\/p>\n Or you can download the file\u00a0mem-info1 <\/a> if the formatting above is all messed up. Make sure you go to the page I linked to above for excellent advice on interpreting the report.<\/p>\n","protected":false},"excerpt":{"rendered":" I was having trouble with a webserver this week, which I'd just set up for a client. When it went live, it seemed OK initially, but when we left it overnight it curled up its toes and died. It was so dead that I couldn't even ssh in to reboot it, so we had to … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","footnotes":""},"categories":[1,4],"tags":[95,134,94,96,85],"class_list":["post-110","post","type-post","status-publish","format-standard","hentry","category-it","category-linux","tag-information","tag-linux","tag-memory","tag-report-troubleshooting","tag-script"],"_links":{"self":[{"href":"https:\/\/play.datalude.com\/blog\/wp-json\/wp\/v2\/posts\/110","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/play.datalude.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/play.datalude.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/play.datalude.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/play.datalude.com\/blog\/wp-json\/wp\/v2\/comments?post=110"}],"version-history":[{"count":0,"href":"https:\/\/play.datalude.com\/blog\/wp-json\/wp\/v2\/posts\/110\/revisions"}],"wp:attachment":[{"href":"https:\/\/play.datalude.com\/blog\/wp-json\/wp\/v2\/media?parent=110"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/play.datalude.com\/blog\/wp-json\/wp\/v2\/categories?post=110"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/play.datalude.com\/blog\/wp-json\/wp\/v2\/tags?post=110"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}#!\/bin\/bash\r\n# Mem-info.sh. Version 1.5 2008-12-20\r\n# Adapted from various sources around the Internet.\r\n# Requires mutt to be installed to use the email function. \r\n\r\n#################### Functions ####################\r\nfunction print_help {\r\n\techo \" Usage:\"\r\n\techo \" $0 [-a full|summary] -f \/tmp\/memoryreport.txt\"\r\n\techo \" Parameters:\"\r\n\techo \" -a Specify full or summary report\"\r\n\techo \" -f Specify alternate filename \"\r\n\techo \" -e <adddr> Send report to specified email address\" \r\n\techo \" -h | --help This usage information\"\r\n\techo \" Running the script with no parameters writes a summary report to .\/output.txt\"\r\n}\r\n\r\nfunction summary_report {\r\n\techo \"=========================== SUMMARY ============================\" > $mem_outputfile\r\n\tdate >> $mem_outputfile\r\n\techo >> $mem_outputfile\r\n\techo \"=========================== uptime ==============================\" >> $mem_outputfile\r\n\tuptime >> $mem_outputfile\r\n\techo >> $mem_outputfile\r\n\techo \"========================== free -m ==============================\" >> $mem_outputfile\r\n\tfree -m >> $mem_outputfile\r\n\techo >> $mem_outputfile\r\n\techo \"========================= vmstat 1.5 ============================\" >> $mem_outputfile\r\n\tvmstat 1 5 >> $mem_outputfile\r\n\techo >> $mem_outputfile\r\n\techo \"================== ps top 20 Processes by CPU ===================\" >> $mem_outputfile\r\n\tps -eo user,%mem,%cpu,pid,cmd --sort -%cpu | head -n 20 >> $mem_outputfile\r\n\techo >> $mem_outputfile\r\n\r\n}\r\n\r\nfunction full_report {\r\n\tsummary_report\r\n\techo \"========================= FULL DETAIL ===========================\" >> $mem_outputfile\r\n\techo \"======================== top raw output =========================\" >> $mem_outputfile\r\n\ttop -b -n 1 >> $mem_outputfile\r\n\techo \" \" >> $mem_outputfile\r\n\techo \"======================= ps auxf raw output ======================\" >> $mem_outputfile\r\n\tps auxf --width=200 >> $mem_outputfile\r\n\techo >> $mem_outputfile\r\n\techo \"=========================== end ================================ \" >> $mem_outputfile\r\n\techo >> $mem_outputfile\r\n\techo >> $mem_outputfile\r\n}\r\n\r\n#################### Process Command line ####################\r\n\r\nwhile [ \"$1\" != \"\" ]; do\r\n case $1 in\r\n -f ) \tshift\r\n mem_outputfile=$1\r\n ;;\r\n -a ) \tshift\r\n\t\t\t\tmem_action=$1\r\n ;;\r\n -e ) shift\r\n\t\t\t\temail_to=$1\r\n\t\t\t\t;;\r\n -h | --help ) print_help\r\n exit\r\n ;;\r\n * ) print_help\r\n exit\r\n\t\t\t\t;;\r\n esac\r\n shift\r\ndone\r\n\r\n######################### Set Defaults #########################\r\nif [ -z \"${mem_action}\" ]; then \r\n echo \" No action Specified. Defaulting to summary report\"\r\n mem_action=\"summary\"\r\nfi\r\nif [ -z \"${mem_outputfile}\" ]; then \r\n echo \" No output file specified. Writing to `pwd`\/output.txt\"\r\n mem_outputfile=\"output.txt\"\r\nfi\r\n\r\n######################### Do Stuff #########################\r\n\r\nif [ \"$mem_action\" = \"full\" ]; then\r\n\t\tfull_report\r\n\telse\r\n\t\tsummary_report\r\nfi\r\n\r\nif [ \"$email_to\" = \"\" ]; then\r\n\t\techo \" No email address specified. Not emailing report.\"\r\n\telse\r\n\t\tmutt -s \"Memory Usage Report\" $email_to < $mem_outputfile\r\nfi<\/pre>\n