htop<\/code><\/h2>\nThe fastest way to see what’s happening on a server right now is top<\/code>. It’s installed on every Linux system by default. SSH into your server and run:<\/p>\n<\/button>Copied to clipboard<\/span><\/p>\ntop<\/code><\/pre>\n<\/div>\nYou’ll see a live-updating table of processes sorted by CPU usage. The header shows overall CPU, memory, and load averages. Press M<\/code> to sort by memory instead, or q<\/code> to quit.<\/p>\nhtop<\/code> is much easier to read and I’d recommend it for anyone who isn’t staring at top<\/code> daily. Install it if it’s not already present:<\/p>\n<\/button>Copied to clipboard<\/span><\/p>\n# AlmaLinux \/ CentOS \/ RHEL\nyum install htop -y\n\n# Ubuntu \/ Debian\napt install htop -y<\/code><\/pre>\n<\/div>\nThen just run htop<\/code>. You’ll get colour-coded CPU bars per core, memory usage, and a scrollable process list. Use F6<\/code> to change sort order.<\/p>\n\ud83d\udcdd Note:<\/strong> Load average (shown in both tools) is often misread. A load of 4.00<\/code> on a 4-core server means the cores are fully saturated. On a 16-core server, the same number is nothing to worry about. Always read load average relative to your core count.<\/p>\nStep 2: Identify Disk Usage and I\/O Bottlenecks<\/h2>\n Disk problems are one of the most common causes of slow servers, and they’re often overlooked because CPU and RAM look fine. Check disk space first:<\/p>\n
<\/button>Copied to clipboard<\/span><\/p>\ndf -h<\/code><\/pre>\n<\/div>\nThis shows all mounted filesystems and their usage percentages. If \/<\/code> or \/var<\/code> is at 90%+, that’s urgent. \/var<\/code> fills up most often because it holds logs, mail queues, and databases.<\/p>\nTo find what’s eating space in a specific directory:<\/p>\n
<\/button>Copied to clipboard<\/span><\/p>\ndu -sh \/var\/* | sort -rh | head -20<\/code><\/pre>\n<\/div>\nFor live disk I\/O \u2014 meaning which processes are reading\/writing right now \u2014 use iotop<\/code>:<\/p>\n<\/button>Copied to clipboard<\/span><\/p>\n# AlmaLinux \/ CentOS\nyum install iotop -y\n\n# Ubuntu \/ Debian\napt install iotop -y\n\n# Run it\niotop -o<\/code><\/pre>\n<\/div>\nThe -o<\/code> flag shows only processes actively doing I\/O, which makes it much less noisy.<\/p>\n\u26a0 Warning:<\/strong> If df -h<\/code> shows a partition at 100%, some services will stop writing logs or accepting connections immediately. Don’t just delete random files \u2014 find the cause first with du<\/code> before clearing anything.<\/p>\nStep 3: Monitor Network Traffic<\/h2>\n High network usage can saturate your server’s bandwidth allocation or indicate something unexpected \u2014 like a DDoS, a misconfigured backup job, or a process exfiltrating data. Use nethogs<\/code> to see bandwidth usage broken down by process:<\/p>\n<\/button>Copied to clipboard<\/span><\/p>\n# AlmaLinux \/ CentOS\nyum install nethogs -y\n\n# Ubuntu \/ Debian\napt install nethogs -y\n\n# Run it on your primary interface (adjust eth0 to match yours)\nnethogs eth0<\/code><\/pre>\n<\/div>\nTo find your interface name, run ip a<\/code> first. On newer systems it’s often ens3<\/code> or enp1s0<\/code> rather than eth0<\/code>.<\/p>\nFor a historical view of bandwidth, vnstat<\/code> is excellent. It logs traffic passively in the background:<\/p>\n<\/button>Copied to clipboard<\/span><\/p>\napt install vnstat -y # or yum\nvnstat -d # daily summary\nvnstat -m # monthly summary<\/code><\/pre>\n<\/div>\nStep 4: Review System Logs for Errors<\/h2>\n Real-time metrics tell you the what; logs tell you the why. The main system log locations you should know:<\/p>\n
\n\/var\/log\/syslog<\/code> (Debian\/Ubuntu) or \/var\/log\/messages<\/code> (RHEL\/AlmaLinux) \u2014 general system events<\/li>\n\/var\/log\/auth.log<\/code> or \/var\/log\/secure<\/code> \u2014 SSH logins and authentication attempts<\/li>\n\/var\/log\/apache2\/error.log<\/code> or \/var\/log\/httpd\/error_log<\/code> \u2014 web server errors<\/li>\n\/var\/log\/mysql\/error.log<\/code> \u2014 database errors and slow query info<\/li>\n<\/ul>\nTo watch a log file live as entries come in:<\/p>\n
<\/button>Copied to clipboard<\/span><\/p>\ntail -f \/var\/log\/syslog<\/code><\/pre>\n<\/div>\nOn systemd-based systems, journalctl<\/code> is often more useful:<\/p>\n<\/button>Copied to clipboard<\/span><\/p>\n# Show errors from the last hour\njournalctl --since "1 hour ago" -p err\n\n# Follow logs for a specific service\njournalctl -u nginx -f<\/code><\/pre>\n<\/div>\nStep 5: Set Up Persistent Monitoring with Netdata or Prometheus<\/h2>\n Command-line tools are great for active diagnosis, but you can’t stare at htop<\/code> all day. For ongoing monitoring with historical graphs and alerting, you need something persistent.<\/p>\nNetdata<\/strong> is my go-to for dedicated servers. It installs in under a minute, runs a local web dashboard on port 19999, and has zero configuration required to get basic metrics. Install it with:<\/p>\n<\/button>Copied to clipboard<\/span><\/p>\nwget -O \/tmp\/netdata-kickstart.sh https:\/\/my-netdata.io\/kickstart.sh\nbash \/tmp\/netdata-kickstart.sh --non-interactive<\/code><\/pre>\n<\/div>\nOnce running, access it at http:\/\/your-server-ip:19999<\/code>. You’ll get CPU per core, RAM, disk I\/O, network, and more \u2014 all with 1-second resolution and 1 hour of history by default.<\/p>\n\ud83d\udcdd Note:<\/strong> Netdata’s port 19999 is open to the world by default. Either restrict it in your firewall to your IP only, or put it behind a reverse proxy with authentication. Don’t leave it publicly accessible on a production server.<\/p>\nFor larger infrastructure with longer retention and multi-server aggregation, Prometheus + Grafana<\/strong> is the standard stack. It’s more complex to set up but significantly more powerful. That’s worth a separate article on its own.<\/p>\nWHM users:<\/strong> If you’re running cPanel\/WHM on your dedicated server, navigate to WHM > Server Status > Service Status<\/strong> and WHM > Server Information<\/strong> for a quick overview of service health and resource usage without leaving the interface.<\/p>\nStep 6: Configure Email or Slack Alerts<\/h2>\n Monitoring without alerting is just a dashboard nobody watches. At minimum, set a disk space alert. With Netdata, alerts are configured in \/etc\/netdata\/health.d\/<\/code>. The disk alert is already active by default \u2014 it fires at 85% and 95% usage.<\/p>\nTo configure email notifications, edit:<\/p>\n
<\/button>Copied to clipboard<\/span><\/p>\nnano \/etc\/netdata\/health_alarm_notify.conf<\/code><\/pre>\n<\/div>\nSet SEND_EMAIL="YES"<\/code> and add your address to DEFAULT_RECIPIENT_EMAIL<\/code>. Netdata also supports Slack, PagerDuty, and webhook integrations in the same file.<\/p>\nCommon Issues and Troubleshooting<\/h2>\nHigh CPU but no obvious process in top<\/code><\/h3>\nThis usually means the offending process is forking and dying quickly, so it doesn’t show up in a snapshot. Run top<\/code> with a faster refresh using top -d 0.5<\/code>, or use atop<\/code> which logs historical process data. Another common cause is kernel-level work showing as kworker<\/code> or kswapd<\/code> \u2014 kswapd<\/code> being busy almost always means you’re low on RAM and the system is swapping heavily to disk.<\/p>\nDisk I\/O is high but iotop<\/code> shows nothing obvious<\/h3>\nIf MySQL or PostgreSQL shows up with moderate I\/O but not extreme usage, the real issue might be a missing index causing full table scans on every query. Enable the slow query log in MySQL by setting slow_query_log = 1<\/code> and long_query_time = 1<\/code> in \/etc\/my.cnf<\/code>, then restart MySQL. Review the log at \/var\/log\/mysql\/slow.log<\/code>.<\/p>\nMemory usage climbs continuously until the server slows to a crawl<\/h3>\n This is a memory leak, and it’s most often Apache with MaxRequestWorkers<\/code> set too high, or PHP-FPM pool settings that allow too many child processes. Each Apache worker or PHP-FPM child can use 30-80MB. Multiply that by 200 workers and you’re in trouble fast. Check your current Apache config at \/etc\/httpd\/conf\/httpd.conf<\/code> or \/etc\/apache2\/apache2.conf<\/code> and reduce MaxRequestWorkers<\/code> to something your RAM can actually support.<\/p>\ndf -h<\/code> shows free space but disk writes are still failing<\/h3>\nYou’ve likely run out of inodes, not disk space. Inodes are metadata slots for individual files \u2014 you can exhaust them if you have millions of tiny files (common with session caches, Maildir mail stores, or certain CMS cache directories). Check with df -i<\/code>. If any filesystem shows 100% inode usage, you need to find and clean up the file count, not just the file size.<\/p>\nNetdata dashboard is unreachable after install<\/h3>\n Almost always a firewall issue. On AlmaLinux\/CentOS with firewalld running, port 19999 is blocked by default. Open it temporarily with firewall-cmd --add-port=19999\/tcp --permanent && firewall-cmd --reload<\/code>. On Ubuntu with UFW: ufw allow 19999\/tcp<\/code>. Then restrict it to your IP as soon as you confirm it’s working.<\/p>\nFAQ<\/h2>\n\n
Frequently Asked Questions<\/h2>\n\n
How do I check CPU usage on a Linux dedicated server?<\/h3>\n\n
SSH into your server and run top<\/code> or htop<\/code> for a real-time process list sorted by CPU usage. For a quick one-line snapshot, mpstat 1 3<\/code> (from the sysstat package) gives you CPU usage averaged over 3 seconds per core. Always compare load average to your total core count \u2014 a load of 8.0 on a 16-core server is fine; on a 2-core server it means serious congestion.<\/p>\n<\/div>\n<\/div>\n\n
What's the best free monitoring tool for a dedicated server?<\/h3>\n\n
Netdata is the easiest to get running quickly \u2014 one install command, no config needed, and you get a full real-time dashboard. For longer-term data retention and multi-server setups, Prometheus with Grafana is the industry standard, though it takes more time to configure. Both are free and open source.<\/p>\n<\/div>\n<\/div>\n
\n
How much RAM should a dedicated server have for web hosting?<\/h3>\n\n
It depends heavily on your software stack. A cPanel\/WHM server running Apache, MySQL, and PHP for moderate traffic typically needs at least 4GB, with 8-16GB recommended for comfort. The bigger factor is your Apache and PHP-FPM worker count \u2014 each worker consumes RAM, and if your config allows more workers than your RAM supports, the server will start swapping to disk, which tanks performance.<\/p>\n<\/div>\n<\/div>\n
\n
How do I get alerted when my server disk is almost full?<\/h3>\n\n
Netdata includes a disk space alert out of the box \u2014 it fires at 85% and 95% usage. Configure email or Slack notifications in \/etc\/netdata\/health_alarm_notify.conf<\/code>. Alternatively, a simple cron job running df -h<\/code> and mailing you the output works fine for basic setups. Either way, don’t rely on manual checks \u2014 disk-full events can happen faster than you expect.<\/p>\n<\/div>\n<\/div>\n\n
My server feels slow but CPU and RAM look normal. What else should I check?<\/h3>\n\n
Disk I\/O is the most common culprit people miss. Run iotop -o<\/code> to see if any process is hammering the disk, and check df -i<\/code> for inode exhaustion (not just disk space). Network latency is another factor \u2014 use mtr your-domain.com<\/code> to check for packet loss between your server and the outside world. Slow DNS resolution can also make requests appear sluggish even when the server itself is healthy.<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"If your dedicated server is sluggish or throwing errors under load, you need visibility into what’s actually happening. This guide walks through the essential monitoring tools and methods \u2014 from quick command-line checks to persistent alerting setups.<\/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":[42],"tags":[380,37,384,381,379,382,378,383],"class_list":["post-179","post","type-post","status-publish","format-standard","hentry","category-dedicated","tag-cpu-usage","tag-dedicated-server","tag-dedicated-server-performance-monitoring","tag-disk-io","tag-linux-performance","tag-server-health","tag-server-monitoring","tag-sysadmin"],"yoast_head":"\n
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