{"id":1713,"date":"2022-09-15T12:30:00","date_gmt":"2022-09-15T17:30:00","guid":{"rendered":"https:\/\/linuxhostsupport.com\/blog\/?p=1713"},"modified":"2022-09-15T07:44:09","modified_gmt":"2022-09-15T12:44:09","slug":"how-to-install-and-configure-csf-on-almalinux","status":"publish","type":"post","link":"https:\/\/linuxhostsupport.com\/blog\/how-to-install-and-configure-csf-on-almalinux\/","title":{"rendered":"How to Install and Configure CSF on AlmaLinux"},"content":{"rendered":"\n<div id=\"linux-3533876509\" class=\"linux-before-1st-paragraph linux-entity-placement\" style=\"margin-top: 15px;margin-bottom: 15px;\"><a href=\"https:\/\/www.rosehosting.com\/managed-vps-hosting\/?mtm_campaign=blogs&#038;mtm_source=lhs&#038;mtm_medium=blog&#038;mtm_content=managed-vps&#038;mtm_cid=1339&#038;mtm_placement=inline\" aria-label=\"Untitled\"><img src=\"https:\/\/linuxhostsupport.com\/blog\/wp-content\/uploads\/2020\/12\/1340090_NVMeGoogleAds_728x90_041322.jpg\" alt=\"\"  srcset=\"https:\/\/linuxhostsupport.com\/blog\/wp-content\/uploads\/2020\/12\/1340090_NVMeGoogleAds_728x90_041322.jpg 728w, https:\/\/linuxhostsupport.com\/blog\/wp-content\/uploads\/2020\/12\/1340090_NVMeGoogleAds_728x90_041322-300x37.jpg 300w\" sizes=\"(max-width: 728px) 100vw, 728px\" width=\"728\" height=\"90\"  style=\"display: inline-block;\" \/><\/a><\/div><p>In this tutorial we are going to install and explain in step-by-step detail how to configure CSF on <a href=\"https:\/\/www.rosehosting.com\/almalinux-hosting\/\">AlmaLinux OS<\/a>.<\/p>\n\n\n\n<p>Config Server Firewall or CSF is a free and advanced firewall for most Linux distributions. CSF can be easily installed on a server with control panels such as DirectAdmin, WHM\/cPanel and etc. It includes security features such as login, intrusion, flood detections, and many more. With CSF we can easily <a href=\"https:\/\/linuxhostsupport.com\/blog\/how-to-block-ip-addresses-in-wordpress\/\">block IP addresses<\/a>, whitelist IP addresses, open and close ports and etc.<\/p>\n\n\n\n<p>Installing and configuring CSF on AlmaLinux is a straightforward process that may take up to 10 minutes. Let&#8217;s get started!<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\">Prerequisites<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>A server with AlmaLinux 20.04 as OS<\/li><li>User privileges: root or non-root user with sudo privileges<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Step 1. Update the System<\/h2>\n\n\n\n<p>Before we install the CSF we need to update the system packages to the latest version available.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo dnf update -y &amp;&amp; sudo dnf upgrade -y<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Step 2. Download and Install CSF<\/h2>\n\n\n\n<p>Install some prerequisites before you download and install CSF<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo dnf install epel-release -y\n\nsudo dnf install iptables perl-libwww-perl.noarch perl-LWP-Protocol-https.noarch perl-GDGraph wget tar perl-Math-BigInt -y<\/pre>\n\n\n\n<p>Then download the CSF file.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">cd \/usr\/src \n\nwget https:\/\/download.configserver.com\/csf.tgz<\/pre>\n\n\n\n<p>Once downloaded, extract the csf file with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">tar zxvf csf.tgz<\/pre>\n\n\n\n<p>Once extracted enter in the <strong>csf<\/strong> directory and execute the script for installation.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">cd csf\/\n\nsh install.sh<\/pre>\n\n\n\n<p>After successfull installation you should receive the following output:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Don't forget to:\n1. Configure the following options in the csf configuration to suite your server: TCP_*, UDP_*\n2. Restart csf and lfd\n3. Set TESTING to 0 once you're happy with the firewall, lfd will not run until you do so\n\nAdding current SSH session IP address to the csf whitelist in csf.allow:\nCan't locate lib.pm in @INC (you may need to install the lib module) (@INC contains: \/usr\/local\/lib64\/perl5\/5.32 \/usr\/local\/share\/perl5\/5.32 \/usr\/lib64\/perl5\/vendor_perl \/usr\/share\/perl5\/vendor_perl \/usr\/lib64\/perl5 \/usr\/share\/perl5) at \/usr\/sbin\/csf line 10.\nBEGIN failed--compilation aborted at \/usr\/sbin\/csf line 10.\n'lfd.service' -&gt; '\/usr\/lib\/systemd\/system\/lfd.service'\n'csf.service' -&gt; '\/usr\/lib\/systemd\/system\/csf.service'\nCreated symlink \/etc\/systemd\/system\/multi-user.target.wants\/csf.service \u2192 \/usr\/lib\/systemd\/system\/csf.service.\nCreated symlink \/etc\/systemd\/system\/multi-user.target.wants\/lfd.service \u2192 \/usr\/lib\/systemd\/system\/lfd.service.\nRemoved \/etc\/systemd\/system\/dbus-org.fedoraproject.FirewallD1.service.\nRemoved \/etc\/systemd\/system\/multi-user.target.wants\/firewalld.service.\nCreated symlink \/etc\/systemd\/system\/firewalld.service \u2192 \/dev\/null.\n'\/etc\/csf\/csfwebmin.tgz' -&gt; '\/usr\/local\/csf\/csfwebmin.tgz'\n\nInstallation Completed\n<\/pre>\n\n\n\n<p>As you can see the first message is a reminder that the CSF is not configured. Before we configure CSF, we can check if the required iptables modules are installed. Execute the command below:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo perl \/usr\/local\/csf\/bin\/csftest.pl<\/pre>\n\n\n\n<p>If everything is OK, you should receive the following output:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">[root@host csf]# sudo perl \/usr\/local\/csf\/bin\/csftest.pl\nTesting ip_tables\/iptable_filter...OK\nTesting ipt_LOG...OK\nTesting ipt_multiport\/xt_multiport...OK\nTesting ipt_REJECT...OK\nTesting ipt_state\/xt_state...OK\nTesting ipt_limit\/xt_limit...OK\nTesting ipt_recent...OK\nTesting xt_connlimit...OK\nTesting ipt_owner\/xt_owner...OK\nTesting iptable_nat\/ipt_REDIRECT...OK\nTesting iptable_nat\/ipt_DNAT...OK\n\nRESULT: csf should function on this server<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Step 3. Manage the CSF service<\/h2>\n\n\n\n<p>In the previous step we downloaded and installed the CSF. After that, we confirmed that the iptables modules are loaded. Next is to start and enable the CSF service.<\/p>\n\n\n\n<p>To start and enable the CSF service execute the commands below:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo systemctl start csf.service &amp;&amp; sudo systemctl enable csf.service<\/pre>\n\n\n\n<p>To check the status of the CSF service:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo systemctl status csf.service<\/pre>\n\n\n\n<p>You should receive the following output:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">[root@host csf]# sudo systemctl status csf\n\u25cf csf.service - ConfigServer Firewall &amp; Security - csf\n   Loaded: loaded (\/usr\/lib\/systemd\/system\/csf.service; enabled; vendor preset: disabled)\n   Active: active (exited) since Mon 2022-08-08 17:13:49 EDT; 5s ago\n Main PID: 6595 (code=exited, status=0\/SUCCESS)\n    Tasks: 0 (limit: 23666)\n   Memory: 0B\n   CGroup: \/system.slice\/csf.service\n\nAug 08 17:13:49 host.test.vps csf[6595]: csf: FASTSTART loading UDP_IN (IPv4)\nAug 08 17:13:49 host.test.vps csf[6595]: csf: FASTSTART loading UDP_OUT (IPv4)\nAug 08 17:13:49 host.test.vps csf[6595]: ACCEPT  all opt -- in lo out *  0.0.0.0\/0  -&gt; 0.0.0.0\/0\nAug 08 17:13:49 host.test.vps csf[6595]: ACCEPT  all opt -- in * out lo  0.0.0.0\/0  -&gt; 0.0.0.0\/0\nAug 08 17:13:49 host.test.vps csf[6595]: LOGDROPOUT  all opt -- in * out !lo  0.0.0.0\/0  -&gt; 0.0.0.0\/0\nAug 08 17:13:49 host.test.vps csf[6595]: LOGDROPIN  all opt -- in !lo out *  0.0.0.0\/0  -&gt; 0.0.0.0\/0\nAug 08 17:13:49 host.test.vps csf[6595]: csf: FASTSTART loading DNS (IPv4)\nAug 08 17:13:49 host.test.vps csf[6595]: LOCALOUTPUT  all opt -- in * out !lo  0.0.0.0\/0  -&gt; 0.0.0.0\/0\nAug 08 17:13:49 host.test.vps csf[6595]: LOCALINPUT  all opt -- in !lo out *  0.0.0.0\/0  -&gt; 0.0.0.0\/0\nAug 08 17:13:49 host.test.vps systemd[1]: Started ConfigServer Firewall &amp; Security - csf.\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Step 4. Configuring CSF<\/h2>\n\n\n\n<p>In Step 2. we received the following output after the installation process:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">1. Configure the following options in the csf configuration to suite your server: TCP_*, UDP_*\n2. Restart csf and lfd\n3. Set TESTING to 0 once you're happy with the firewall, lfd will not run until you do so.<\/pre>\n\n\n\n<p>First add the following ports for TCP in <strong>\/etc\/csf.conf<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"># Allow incoming TCP ports\nTCP_IN = \"20,21,22,25,53,80,110,143,443,465,587,993,995\"\n\n# Allow outgoing TCP ports\nTCP_OUT = \"20,21,22,25,53,80,110,113,443,587,993,995\"<\/pre>\n\n\n\n<p>Next, set Testing to 0<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"># lfd will not start while this is enabled\nTESTING = \"0\"\n<\/pre>\n\n\n\n<p>End the last is to start the ldf service and restart the CSF for the changes to take effectivity<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo systemctl start lfd.service\n\nsudo systemctl restart csf.service<\/pre>\n\n\n\n<p>Check the status of the lfd service<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo systemctl status lfd.service<\/pre>\n\n\n\n<p>You should receive the following output:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">[root@host csf]# systemctl status lfd\n\u25cf lfd.service - ConfigServer Firewall &amp; Security - lfd\n   Loaded: loaded (\/usr\/lib\/systemd\/system\/lfd.service; enabled; vendor preset: disabled)\n   Active: active (running) since Mon 2022-08-08 17:31:26 EDT; 13s ago\n  Process: 6961 ExecStart=\/usr\/sbin\/lfd (code=exited, status=0\/SUCCESS)\n Main PID: 6970 (lfd - sleeping)\n    Tasks: 1 (limit: 23666)\n   Memory: 124.2M\n   CGroup: \/system.slice\/lfd.service\n           \u2514\u25006970 lfd - sleeping\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Step 5. Basic CSF commands<\/h2>\n\n\n\n<p>This is the last step of our tutorial about CSF and in this paragraph we will show you some basic CSF commands.<\/p>\n\n\n\n<p><strong>Enable CSF<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">csf -e<\/pre>\n\n\n\n<p><strong>Whitelist IP address in CSF<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">csf -a 192.168.1.1<\/pre>\n\n\n\n<p><strong>Block IP address in CSF<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">csf -d 192.168.1.2<\/pre>\n\n\n\n<p><strong>Displays the current list of temporary allow and deny IP entries with their TTL and comments<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">csf -t<\/pre>\n\n\n\n<p>Restart CSF<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">csf -r<\/pre>\n\n\n\n<p><strong>Disable CSF<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">csf -x<\/pre>\n\n\n\n<p>That&#8217;s it. You successfully installed and configured CSF on AlmaLinux OS. Also, you learned the most used CSF commands in no time. If you find any difficulties with this setup you can always contact <a href=\"https:\/\/linuxhostsupport.com\/support.html\">our technical support<\/a> and we will help you immediately. We are available 24\/7. You just need to sign up for one of our NVMe VPS plans and submit a support ticket.<\/p>\n\n\n\n<p>If you liked this about installing and configuring CSF on AlmaLinux, please share it with your friends on the social networks using the buttons on the left or simply leave a reply below.<\/p><div id=\"linux-1178922877\" class=\"linux-after-8th-paragraph linux-entity-placement\" style=\"margin-top: 15px;margin-bottom: 15px;\"><a href=\"https:\/\/www.rosehosting.com\/managed-vps-hosting\/?mtm_campaign=blogs&#038;mtm_source=lhs&#038;mtm_medium=blog&#038;mtm_content=managed-vps&#038;mtm_cid=1340&#038;mtm_placement=inline\" aria-label=\"Untitled\"><img src=\"https:\/\/linuxhostsupport.com\/blog\/wp-content\/uploads\/2020\/12\/1340095_VPSGoogleAds_728x90_042622.jpg\" alt=\"\"  srcset=\"https:\/\/linuxhostsupport.com\/blog\/wp-content\/uploads\/2020\/12\/1340095_VPSGoogleAds_728x90_042622.jpg 728w, https:\/\/linuxhostsupport.com\/blog\/wp-content\/uploads\/2020\/12\/1340095_VPSGoogleAds_728x90_042622-300x37.jpg 300w\" sizes=\"(max-width: 728px) 100vw, 728px\" width=\"728\" height=\"90\"  style=\"display: inline-block;\" \/><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>In this tutorial we are going to install and explain in step-by-step detail how to configure CSF on AlmaLinux OS. Config Server Firewall or CSF is a free and advanced firewall for most Linux distributions. CSF can be easily installed on a server with control panels such as DirectAdmin, WHM\/cPanel and etc. It includes security [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1717,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,2],"tags":[220,227,199],"class_list":["post-1713","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guides","category-tutorials","tag-almalinux","tag-csf","tag-how-to-install"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Install and Configure CSF on AlmaLinux | LinuxHostSupport<\/title>\n<meta name=\"description\" content=\"In this tutorial we are going to explain in step-by-step detail how to install and configure CSF on AlmaLinux OS. 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