I have a c1.medium tier server running Ubuntu 12.04 on AWS EC2. We use it as a development server, hosting between 5-8 Drupal 7 sites on it. Recently the server has been performing very slowly and I'm struggling to find why. I've searched logs, but can't detect anything obvious. I've notice whenever the server starts to crawl / crash - looking at the cloud watch graphs on the EC2 console, there is always an unusual spike. Any recommendations on how to investigate and identify these problems and where they're coming from.. I've attached the output of top
and a snippet of my apache2.conf file.
Tasks: 117 total, 1 running, 113 sleeping, 3 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1733244k total, 1647596k used, 85648k free, 4612k buffers Swap: 917500k total, 644984k used, 272516k free, 69512k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 16417 mysql 20 0 1317m 199m 1784 S 0 11.8 3:19.84 mysqld 18087 www-data 20 0 483m 139m 3132 S 0 8.3 0:11.15 apache2 18019 www-data 20 0 483m 136m 3208 S 0 8.1 0:13.52 apache2 18088 www-data 20 0 477m 131m 2952 S 0 7.8 0:10.31 apache2 17958 www-data 20 0 533m 130m 2948 S 0 7.7 0:16.77 apache2 17959 www-data 20 0 450m 103m 3192 S 0 6.1 2:05.47 apache2 17987 www-data 20 0 443m 97m 3188 S 0 5.8 0:10.76 apache2 17961 www-data 20 0 438m 95m 3180 S 0 5.7 0:13.21 apache2 18089 www-data 20 0 443m 83m 3172 S 0 4.9 0:06.69 apache2 18068 www-data 20 0 412m 68m 3148 S 0 4.0 0:07.99 apache2 18459 www-data 20 0 411m 68m 3204 S 0 4.0 0:01.27 apache2 17960 www-data 20 0 410m 67m 3812 S 0 4.0 0:06.79 apache2 18283 ubuntu 20 0 26720 6908 0 S 0 0.4 0:00.59 bash 18460 www-data 20 0 350m 2788 804 S 0 0.2 0:00.00 apache2 13391 root 20 0 350m 1700 16 S 0 0.1 0:03.25 apache2 17830 ubuntu 20 0 26768 1468 620 S 0 0.1 0:01.48 bash 18463 ubuntu 20 0 17332 1288 944 R 0 0.1 0:00.04 top 8024 root 20 0 2632m 936 0 S 0 0.1 14:24.58 java 18134 root 20 0 73352 772 0 S 0 0.0 0:00.06 sshd 18282 ubuntu 20 0 73352 756 0 S 0 0.0 0:00.03 sshd 1 root 20 0 24420 516 0 S 0 0.0 0:13.99 init 909 postfix 20 0 27372 348 208 S 0 0.0 0:43.46 qmgr 797 root 20 0 15972 320 232 S 0 0.0 25:04.39 irqbalance 900 root 20 0 25096 272 172 S 0 0.0 1:49.94 master 664 syslog 20 0 248m 244 0 S 0 0.0 18:20.90 rsyslogd 16201 ubuntu 20 0 73468 220 0 S 0 0.0 0:00.07 sshd 16904 ubuntu 20 0 73468 216 0 S 0 0.0 0:00.03 sshd
Timeout 20 KeepAlive On MaxKeepAliveRequests 500 KeepAliveTimeout 2 IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 12 MaxClients 40 MaxRequestsPerChild 10000 /IfModule>
Completely new to all of this.. any advice much appreciated. Cheers
top
output looks like a completely idle server.sar
(sysstat) might get you a quick diagnosis (especially if you already have it setup), butatop
will likely provide you with more detailed information. (Also: unusual spike in which graph(s) (IO, RAM, CPU, etc.)?