{"id":224,"date":"2026-06-03T23:03:30","date_gmt":"2026-06-04T06:03:30","guid":{"rendered":"https:\/\/hostandtech.com\/kb\/vps\/how-to-monitor-vps-performance\/"},"modified":"2026-06-03T23:03:30","modified_gmt":"2026-06-04T06:03:30","slug":"how-to-monitor-vps-performance","status":"publish","type":"post","link":"https:\/\/hostandtech.com\/kb\/vps\/how-to-monitor-vps-performance\/","title":{"rendered":"How to Monitor VPS Performance: CPU, RAM, Disk, and Network"},"content":{"rendered":"<h2>Overview<\/h2>\n<p>VPS monitoring means keeping an eye on your server&#8217;s core resources: CPU usage, memory, disk I\/O, and network throughput. If your site is slow, your app is crashing, or you&#8217;re getting out-of-memory errors, the answer is almost always hiding in one of those four areas.<\/p>\n<p>Most users only check performance <em>after<\/em> something goes wrong. The smarter approach is setting up basic monitoring from day one, so you have a baseline to compare against when things go sideways. A server that&#8217;s sitting at 90% CPU load at 3am is a problem you want to catch before your customers do.<\/p>\n<p>This article covers both command-line tools for immediate diagnosis and longer-term monitoring options. Whether you&#8217;re on a <a href=\"https:\/\/www.hostandtech.com\/vps-ssd-servers\">VPS SSD Hosting<\/a> plan or managing a fleet of servers, the fundamentals here apply.<\/p>\n<h2>Prerequisites<\/h2>\n<ul>\n<li>SSH access to your VPS (root or sudo user)<\/li>\n<li>A Linux-based VPS running Ubuntu 20.04\/22.04\/24.04, Debian 11\/12, AlmaLinux 8\/9, or CentOS Stream 9<\/li>\n<li>Basic comfort with the command line \u2014 you don&#8217;t need to be a sysadmin, but you&#8217;ll be running commands<\/li>\n<li>Optional: a monitoring tool account if you plan to set up alerting (covered in Step 5)<\/li>\n<\/ul>\n<h2>Step-by-Step: Monitoring Your VPS Performance<\/h2>\n<h3>Step 1: Check Real-Time CPU and Memory Usage with <code class=\"\" data-line=\"\">top<\/code> or <code class=\"\" data-line=\"\">htop<\/code><\/h3>\n<p>The fastest way to see what&#8217;s eating your resources is <code class=\"\" data-line=\"\">top<\/code>, which comes pre-installed on every Linux distro. SSH into your VPS and run:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-1\"><code class=\"\" data-line=\"\">top<\/code><\/pre>\n<\/div>\n<p>You&#8217;ll see a live-updating table of processes sorted by CPU usage. The header shows overall CPU percentages, total vs. used memory, and swap usage. Press <strong>M<\/strong> to sort by memory instead, or <strong>Q<\/strong> to quit.<\/p>\n<p>If you want something more readable, install <code class=\"\" data-line=\"\">htop<\/code>:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-2\"><code class=\"\" data-line=\"\"># Ubuntu\/Debian\napt install htop -y\n\n# AlmaLinux\/CentOS Stream\ndnf install htop -y\n\n# Run it\nhtop<\/code><\/pre>\n<\/div>\n<p><code class=\"\" data-line=\"\">htop<\/code> gives you colour-coded bars for each CPU core and memory, plus the ability to kill processes directly. I&#8217;d recommend it over plain <code class=\"\" data-line=\"\">top<\/code> for day-to-day use.<\/p>\n<p>\ud83d\udcdd Note: High CPU from a process called <code class=\"\" data-line=\"\">kswapd0<\/code> almost always means your VPS is running out of RAM and swapping to disk aggressively. That&#8217;s a memory problem, not a CPU problem \u2014 don&#8217;t just add a bigger CPU plan without checking RAM first.<\/p>\n<h3>Step 2: Check Disk Usage and I\/O<\/h3>\n<p>Disk space and disk speed are two separate things. Check space first:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-3\"><code class=\"\" data-line=\"\">df -h<\/code><\/pre>\n<\/div>\n<p>This shows all mounted filesystems with human-readable sizes. Pay attention to the <code class=\"\" data-line=\"\">Use%<\/code> column. If your root partition (<code class=\"\" data-line=\"\">\/<\/code>) is above 85%, you&#8217;re in danger territory \u2014 many services start behaving oddly or failing entirely at 95%+.<\/p>\n<p>To check what&#8217;s actually consuming space:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-4\"><code class=\"\" data-line=\"\">du -sh \/* 2&gt;\/dev\/null | sort -rh | head -20<\/code><\/pre>\n<\/div>\n<p>This ranks the top 20 directories by size. Bloated <code class=\"\" data-line=\"\">\/var\/log<\/code> directories are a very common culprit, especially on servers running cPanel or busy mail services.<\/p>\n<p>For disk I\/O (read\/write speed in real time), use <code class=\"\" data-line=\"\">iostat<\/code> from the <code class=\"\" data-line=\"\">sysstat<\/code> package:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-5\"><code class=\"\" data-line=\"\"># Install sysstat\napt install sysstat -y   # Debian\/Ubuntu\ndnf install sysstat -y   # AlmaLinux\/CentOS\n\n# Run iostat \u2014 refresh every 2 seconds\niostat -xz 2<\/code><\/pre>\n<\/div>\n<p>Watch the <code class=\"\" data-line=\"\">%util<\/code> column for each disk device. If a device is consistently above 80-90% utilised, your storage is a bottleneck. On an SSD-backed VPS this is less common, but it does happen under heavy database load.<\/p>\n<h3>Step 3: Monitor Network Traffic<\/h3>\n<p>To see live network usage per interface, use <code class=\"\" data-line=\"\">nload<\/code> or <code class=\"\" data-line=\"\">iftop<\/code>:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-6\"><code class=\"\" data-line=\"\"># Install and run nload\napt install nload -y\nnload eth0<\/code><\/pre>\n<\/div>\n<p>Replace <code class=\"\" data-line=\"\">eth0<\/code> with your actual interface name. If you&#8217;re not sure what it&#8217;s called, run <code class=\"\" data-line=\"\">ip a<\/code> to list all interfaces \u2014 on newer systems it might be <code class=\"\" data-line=\"\">ens3<\/code>, <code class=\"\" data-line=\"\">ens18<\/code>, or similar.<\/p>\n<p>For a breakdown of which connections are consuming the most bandwidth:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-7\"><code class=\"\" data-line=\"\">apt install iftop -y\niftop -i eth0<\/code><\/pre>\n<\/div>\n<p>\u26a0 Warning: If you see unexpected outbound traffic spikes to unfamiliar IPs, don&#8217;t ignore it. It can indicate a compromised service or a script sending spam. Check your process list and outbound firewall rules immediately.<\/p>\n<h3>Step 4: Review System Logs for Performance-Related Errors<\/h3>\n<p>Raw metrics tell you something is wrong. Logs tell you why. Check the system journal for errors in the last hour:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-8\"><code class=\"\" data-line=\"\">journalctl -p err --since &quot;1 hour ago&quot;<\/code><\/pre>\n<\/div>\n<p>For OOM (out-of-memory) killer events specifically \u2014 this is where Linux starts forcibly killing processes because RAM ran out:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-9\"><code class=\"\" data-line=\"\">dmesg | grep -i &quot;oom|killed process&quot;<\/code><\/pre>\n<\/div>\n<p>OOM kills are one of the most common causes of unexplained service restarts on VPS plans with 1-2GB RAM. If you see these regularly, you either need more memory or you need to tune the memory limits on your heaviest processes (MySQL&#8217;s <code class=\"\" data-line=\"\">innodb_buffer_pool_size<\/code> is a frequent offender).<\/p>\n<h3>Step 5: Set Up Ongoing Monitoring with Netdata or Prometheus<\/h3>\n<p>Running commands manually is fine for a quick check, but you need historical data to spot trends. I&#8217;d recommend <strong>Netdata<\/strong> for most VPS users \u2014 it&#8217;s lightweight, installs in one command, and gives you a web dashboard with 1-second metric resolution:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-10\"><code class=\"\" data-line=\"\">wget -O \/tmp\/netdata-kickstart.sh https:\/\/get.netdata.cloud\/kickstart.sh\nbash \/tmp\/netdata-kickstart.sh<\/code><\/pre>\n<\/div>\n<p>Once installed, Netdata runs on port <code class=\"\" data-line=\"\">19999<\/code> by default. Access it at <code class=\"\" data-line=\"\">http:\/\/YOUR_VPS_IP:19999<\/code>. Make sure port 19999 is open in your firewall, or set up an Nginx reverse proxy if you want it accessible over HTTPS.<\/p>\n<p>\ud83d\udcdd Note: Netdata stores metrics in RAM by default, so it won&#8217;t persist after a reboot unless you configure a database backend. For basic monitoring, this is fine \u2014 you&#8217;re using it to watch live trends, not audit months of history.<\/p>\n<p>For more complex setups (multiple servers, long-term retention, alerting to Slack or PagerDuty), look at the <strong>Prometheus + Grafana<\/strong> stack. It&#8217;s a heavier install but gives you far more flexibility.<\/p>\n<h2>Common Issues and Troubleshooting<\/h2>\n<h3>High CPU Usage with No Obvious Process<\/h3>\n<p>You open <code class=\"\" data-line=\"\">htop<\/code> and CPU is pegged at 90%+, but no single process stands out. This often means many small processes are running, or a process is spawning and dying too quickly to catch in a snapshot. Run this to sample the top CPU consumers over 5 seconds:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-11\"><code class=\"\" data-line=\"\">ps aux --sort=-%cpu | head -15<\/code><\/pre>\n<\/div>\n<p>Also check for runaway cron jobs: <code class=\"\" data-line=\"\">grep -r &#039;&#039; \/etc\/cron* \/var\/spool\/cron\/<\/code>. A misconfigured cron task looping every minute is surprisingly common.<\/p>\n<h3>VPS Feels Slow But CPU and RAM Look Fine<\/h3>\n<p>This is almost always disk I\/O wait. In <code class=\"\" data-line=\"\">top<\/code>, look at the <code class=\"\" data-line=\"\">wa<\/code> value in the CPU line (e.g., <code class=\"\" data-line=\"\">%Cpu(s): 2.1 us, 0.5 sy, 0.0 ni, 80.2 id, 17.1 wa<\/code>). Anything above 5-10% I\/O wait means your processes are spending significant time waiting on disk. Run <code class=\"\" data-line=\"\">iostat -xz 2<\/code> to confirm which device is saturated.<\/p>\n<h3>Memory Usage Shows 100% but Server Isn&#8217;t Crashing<\/h3>\n<p>Linux intentionally uses free RAM for disk caching \u2014 it&#8217;s not wasted, it&#8217;s being useful. The number you actually care about is available memory, not free memory. Run:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-12\"><code class=\"\" data-line=\"\">free -h<\/code><\/pre>\n<\/div>\n<p>Look at the <code class=\"\" data-line=\"\">available<\/code> column in the <code class=\"\" data-line=\"\">Mem<\/code> row. That&#8217;s the memory actually available for new processes. If that number is near zero, you have a real memory shortage. If it&#8217;s healthy, your server is fine.<\/p>\n<h3>Netdata Dashboard Not Loading on Port 19999<\/h3>\n<p>Almost always a firewall rule. If you&#8217;re using <code class=\"\" data-line=\"\">ufw<\/code>:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-13\"><code class=\"\" data-line=\"\">ufw allow 19999\/tcp\nufw reload<\/code><\/pre>\n<\/div>\n<p>If you&#8217;re using <code class=\"\" data-line=\"\">firewalld<\/code> (AlmaLinux\/CentOS):<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-14\"><code class=\"\" data-line=\"\">firewall-cmd --permanent --add-port=19999\/tcp\nfirewall-cmd --reload<\/code><\/pre>\n<\/div>\n<p>Also verify Netdata is actually running: <code class=\"\" data-line=\"\">systemctl status netdata<\/code><\/p>\n<h3>Disk Space Keeps Filling Up Unexpectedly<\/h3>\n<p>Nine times out of ten it&#8217;s logs. Check <code class=\"\" data-line=\"\">\/var\/log<\/code> with <code class=\"\" data-line=\"\">du -sh \/var\/log\/*<\/code>. Also check for large core dump files: <code class=\"\" data-line=\"\">find \/ -name &quot;core&quot; -size +100M 2&gt;\/dev\/null<\/code>. On cPanel servers, mail queue files in <code class=\"\" data-line=\"\">\/var\/spool\/exim<\/code> can grow to gigabytes if something is stuck.<\/p>\n<h2>FAQ<\/h2>\n<div class=\"ht-faq-section\">\n<h2>Frequently Asked Questions<\/h2>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">How do I check VPS CPU usage from the command line?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>Run <code class=\"\" data-line=\"\">top<\/code> or <code class=\"\" data-line=\"\">htop<\/code> after SSHing into your server. The header shows overall CPU percentages broken down into user processes, system processes, and idle time. For a non-interactive snapshot, <code class=\"\" data-line=\"\">mpstat 1 5<\/code> (from the sysstat package) gives you five readings one second apart, which is useful for scripting or quick checks.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">How much RAM does my VPS actually need?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>It depends entirely on your workload, but a common trap is assuming you need more RAM when the real problem is a misconfigured MySQL or PHP-FPM that&#8217;s consuming more than it should. Run <code class=\"\" data-line=\"\">free -h<\/code> and check the &#8216;available&#8217; column \u2014 not &#8216;free&#8217;. If available memory is consistently under 200MB, it&#8217;s time to either optimise your services or upgrade your plan.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">What&#039;s the best free monitoring tool for a VPS?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>For a single VPS, Netdata is hard to beat \u2014 it installs in minutes, uses minimal resources, and gives you a detailed real-time dashboard. If you&#8217;re managing multiple servers, Prometheus with Grafana gives you centralised metrics and long-term storage, though the setup takes longer. Both are free and open-source.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">How do I get email alerts when my VPS CPU or RAM is high?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>Netdata includes a built-in alerting engine that can send emails, Slack messages, or PagerDuty notifications out of the box. Configure your alert contacts in <code class=\"\" data-line=\"\">\/etc\/netdata\/health_alarm_notify.conf<\/code>. Alternatively, most managed monitoring services (like UptimeRobot for basic uptime, or Better Uptime for resource alerts) support VPS metric alerts through an agent install.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">Does monitoring software slow down my VPS?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>Netdata typically uses under 1-2% CPU and around 30-50MB of RAM \u2014 negligible on any modern VPS. The heavier concern is writing metrics to disk constantly; Netdata avoids this by storing data in memory by default. If you&#8217;re on a very small plan (512MB RAM), factor that into your decision, but on a standard VPS it&#8217;s not an issue.<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Not sure why your VPS feels sluggish? This guide walks you through the essential tools and commands for monitoring CPU, RAM, disk, and network performance \u2014 so you can find the problem instead of guessing.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[3],"tags":[380,628,627,629,447,7,448,31],"class_list":["post-224","post","type-post","status-publish","format-standard","hentry","category-vps","tag-cpu-usage","tag-disk-i-o","tag-linux-server-tools","tag-ram-monitoring","tag-server-performance","tag-server-resources","tag-vps-management","tag-vps-monitoring"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Monitor VPS Performance: CPU, RAM, Disk, and Network<\/title>\n<meta name=\"description\" content=\"Learn how to monitor VPS performance using built-in Linux tools and third-party services. 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