{"id":19287,"date":"2016-05-30T07:54:29","date_gmt":"2016-05-30T12:54:29","guid":{"rendered":"https:\/\/www.rosehosting.com\/blog\/?p=19287"},"modified":"2022-06-03T03:42:53","modified_gmt":"2022-06-03T08:42:53","slug":"basic-system-monitoring-tools-in-centos-7","status":"publish","type":"post","link":"https:\/\/www.rosehosting.com\/blog\/basic-system-monitoring-tools-in-centos-7\/","title":{"rendered":"Basic system monitoring tools in CentOS 7"},"content":{"rendered":"
<\/div>

\"Basic<\/p>\n

In this post, we are going to show you how to use the basic system monitoring tools on a Linux VPS running CentOS 7 as operating system.
\n<\/p>\n

Determining which processes are running, the amount of free memory on your system as well as the free SSD storage available to use is crucial when configuring the system. One of the basic system monitoring tools which is available on all Linux systems is ps<\/code>. The ps<\/code> command will report a snapshot of the current processes running on your CentOS VPS<\/a> and will display information about a selection of active processes. The ps<\/code>\u00a0command has many different options which can be mixed. In many situations, ps aux<\/code> will provide you with all the information you need.<\/p>\n

# ps aux<\/pre>\n

The output of the command will provide you with information such as the process owner, ID of the process, CPU and memory usage, the time or date when the process was started, etc. The output should be similar to the one below:<\/p>\n

# ps aux\r\nUSER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND\r\nroot         1  0.5  0.2  41220  3660 ?        Ss   08:53   0:00 init -z\r\nroot         2  0.0  0.0      0     0 ?        S    08:53   0:00 [kthreadd]\r\nroot         3  0.0  0.0      0     0 ?        S    08:53   0:00 [khelper]\r\nroot        65  0.0  0.1  36768  1820 ?        Ss   08:53   0:00 \/usr\/lib\/systemd\/systemd-journald\r\nroot        73  0.0  0.1  41600  1700 ?        Ss   08:53   0:00 \/usr\/lib\/systemd\/systemd-udevd\r\nroot       103  0.0  0.0  24224  1536 ?        Ss   08:53   0:00 \/usr\/lib\/systemd\/systemd-logind\r\nroot       109  0.0  0.1 293512  2608 ?        Ssl  08:53   0:00 \/usr\/sbin\/rsyslogd -n\r\ndbus       112  0.0  0.1  26548  1680 ?        Ss   08:53   0:00 \/bin\/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation\r\nroot       137  0.0  0.2  82504  3576 ?        Ss   08:53   0:00 \/usr\/sbin\/sshd -D\r\n...<\/pre>\n

For more usage examples and options visit the man page:<\/p>\n

# man ps<\/pre>\n

The next useful tool for system monitoring is top<\/code>. Similarly to ps<\/code>, top<\/code> displays the Linux processes running on your server in real-time but the output is dynamic. Run top<\/code> to check the output:<\/p>\n

# top\r\ntop - 09:01:41 up 8 min,  0 users,  load average: 0.00, 0.00, 0.00\r\nTasks:  32 total,   1 running,  31 sleeping,   0 stopped,   0 zombie\r\n%Cpu(s):  0.2 us,  0.0 sy,  0.0 ni, 99.8 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st\r\nKiB Mem :  1572864 total,  1318572 free,    28772 used,   225520 buff\/cache\r\nKiB Swap:        0 total,        0 free,        0 used.  1331552 avail Mem\r\n\r\n  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND\r\n  718 root      20   0  155404   2144   1540 R   0.3  0.1   0:00.05 top\r\n    1 root      20   0   41220   3660   2276 S   0.0  0.2   0:00.25 systemd\r\n    2 root      20   0       0      0      0 S   0.0  0.0   0:00.00 kthreadd\r\n    3 root      20   0       0      0      0 S   0.0  0.0   0:00.00 khelper\r\n   65 root      20   0   36768   1820   1540 S   0.0  0.1   0:00.02 systemd-journal\r\n   73 root      20   0   41600   1700   1272 S   0.0  0.1   0:00.00 systemd-udevd\r\n  103 root      20   0   24224   1540   1292 S   0.0  0.1   0:00.00 systemd-logind\r\n  109 root      20   0  293512   2608   2008 S   0.0  0.2   0:00.00 rsyslogd<\/pre>\n

To terminate the utility, enter q<\/code>. To sort the list by memory or CPU usage, enter M<\/code> or P<\/code> respectively. The man page of top<\/code> will provide you with additional information about the usage.<\/p>\n

# man top<\/pre>\n

To determine the memory usage, run the following command:<\/p>\n

# free -m<\/pre>\n

The free<\/code> command will display amount of free and used memory in the system in megabytes. It will provide you with information about the total amount of memory, the amount of memory which is used, free, shared, cached and available. The free<\/code> command will provide you with information about the swap space too.<\/p>\n

# free -m\r\n              total        used        free      shared  buff\/cache   available\r\nMem:           1536          31        1282         136         221        1296\r\nSwap:             0           0           0\r\n<\/pre>\n

Visit the man page for more information and usage options:<\/p>\n

# man free<\/pre>\n

Next, the df<\/code> command will display a report of the file system disk space usage. To view the information in human readable format, run:<\/p>\n

# df -h<\/pre>\n

The output should look like the one below:<\/p>\n

# df -h\r\nFilesystem      Size  Used Avail Use% Mounted on\r\n\/dev\/simfs       30G  1.9G   29G   7% \/\r\ndevtmpfs        768M     0  768M   0% \/dev\r\ntmpfs           768M     0  768M   0% \/dev\/shm\r\ntmpfs           768M  8.1M  760M   2% \/run\r\ntmpfs           768M     0  768M   0% \/sys\/fs\/cgroup<\/pre>\n

The man page will provide you with additional information about the usage.<\/p>\n

# man df<\/pre>\n

The last tool we are going to write about is du<\/code>. This command will display an estimate file space usage. For example, to display the total space usage of the \/home directory, you can use the following command:<\/p>\n

# du -sxch \/home\/<\/pre>\n

Sample output:<\/p>\n

# du -sxch \/home\/\r\n391M    \/home\/\r\n391M    total\r\n<\/pre>\n

To learn more about the du<\/code> command and the other usage options, visit the man page:<\/p>\n

# man du<\/pre>\n
\n

Of course you don\u2019t have to do any of this if you use one of our CentOS 7 VPS hosting<\/a> services, in which case you can simply ask our expert Linux admins to help you determine the resource usage on your server. They are available 24\u00d77 and will take care of your request immediately.<\/p>\n

PS<\/span><\/strong>. If you liked this post please share it with your friends on the social networks using the buttons on the left or simply leave a reply below. Thanks.<\/p>\n","protected":false},"excerpt":{"rendered":"

In this post, we are going to show you how to use the basic system monitoring tools on a Linux … <\/p>\n

Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":25158,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[34,1259],"yoast_head":"\nBasic system monitoring tools in CentOS 7 - RoseHosting<\/title>\n<meta name=\"description\" content=\"Basic system monitoring tools in CentOS 7 - RoseHosting\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.rosehosting.com\/blog\/basic-system-monitoring-tools-in-centos-7\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Basic system monitoring tools in CentOS 7 - RoseHosting\" \/>\n<meta property=\"og:description\" content=\"Basic system monitoring tools in CentOS 7 - RoseHosting\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.rosehosting.com\/blog\/basic-system-monitoring-tools-in-centos-7\/\" \/>\n<meta property=\"og:site_name\" content=\"RoseHosting\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/RoseHosting\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/rosehosting.helpdesk\" \/>\n<meta property=\"article:published_time\" content=\"2016-05-30T12:54:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-06-03T08:42:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2016\/05\/Basic-system-monitoring-tools-in-CentOS-7.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"600\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Jeff Wilson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@rosehosting\" \/>\n<meta name=\"twitter:site\" content=\"@rosehosting\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jeff Wilson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.rosehosting.com\/blog\/basic-system-monitoring-tools-in-centos-7\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.rosehosting.com\/blog\/basic-system-monitoring-tools-in-centos-7\/\"},\"author\":{\"name\":\"Jeff Wilson\",\"@id\":\"https:\/\/www.rosehosting.com\/blog\/#\/schema\/person\/7ce77a842fa6a9a7f8efa186f2353713\"},\"headline\":\"Basic system monitoring tools in CentOS 7\",\"datePublished\":\"2016-05-30T12:54:29+00:00\",\"dateModified\":\"2022-06-03T08:42:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.rosehosting.com\/blog\/basic-system-monitoring-tools-in-centos-7\/\"},\"wordCount\":484,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.rosehosting.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.rosehosting.com\/blog\/basic-system-monitoring-tools-in-centos-7\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2016\/05\/Basic-system-monitoring-tools-in-CentOS-7.jpg\",\"keywords\":[\"centos\",\"system monitoring\"],\"articleSection\":[\"Tips and Tricks\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.rosehosting.com\/blog\/basic-system-monitoring-tools-in-centos-7\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.rosehosting.com\/blog\/basic-system-monitoring-tools-in-centos-7\/\",\"url\":\"https:\/\/www.rosehosting.com\/blog\/basic-system-monitoring-tools-in-centos-7\/\",\"name\":\"Basic system monitoring tools in CentOS 7 - 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