This blog describes the setup of a Consul Cluster on RHEL 8 and clones, it will be the base for a Patroni HA setup using RPM Packages from postgresql.org.
\nMany Patroni setups are using ETCD, but ETCD is not available as RPM out of the box for RHEL 8 and clones, and in many cases using tar files or RPMS from unknown sources are not allowed.<\/p>\n
I use OS Rocky Linux 8.5 minimal installation patched before writing this blog.<\/p>\n
\n[root@patroni-01 ~]# cat \/etc\/os-release\nNAME=\"Rocky Linux\"\nVERSION=\"8.5 (Green Obsidian)\"\nID=\"rocky\"\nID_LIKE=\"rhel centos fedora\"\nVERSION_ID=\"8.5\"\nPLATFORM_ID=\"platform:el8\"\nPRETTY_NAME=\"Rocky Linux 8.5 (Green Obsidian)\"\nANSI_COLOR=\"0;32\"\nCPE_NAME=\"cpe:\/o:rocky:rocky:8:GA\"\nHOME_URL=\"https:\/\/rockylinux.org\/\"\nBUG_REPORT_URL=\"https:\/\/bugs.rockylinux.org\/\"\nROCKY_SUPPORT_PRODUCT=\"Rocky Linux\"\nROCKY_SUPPORT_PRODUCT_VERSION=\"8\"\n[root@patroni-01 ~]#\n<\/pre>\nIt will be a three node cluster with the following nodes:<\/p>\n
\n[root@patroni-01 ~]# cat \/etc\/hosts\n127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4\n192.168.198.132 patroni-01.patroni.test patroni-01\n192.168.198.133 patroni-02.patroni.test patroni-02\n192.168.198.134 patroni-03.patroni.test patroni-03\n[root@patroni-01 ~]#\n<\/pre>\nThe installation RPM for Consul will come from the postgresql.org repository, so we need to disable postgresql from the OS Repository on all three nodes.<\/p>\n
\n$ [root@patroni-01 ~]# dnf -y module disable postgresql\n$ Last metadata expiration check: 1:21:07 ago on Fri 04 Mar 2022 12:53:22 PM CET.\n$ Dependencies resolved.\n$ ====================================================================================================\n$ Package Architecture Version Repository Size\n$ ====================================================================================================\n$ Disabling modules:\n$ postgresql\n$ \n$ Transaction Summary\n$ ====================================================================================================\n$ \n$ Complete!\n$ [root@patroni-01 ~]#\n<\/pre>\nNext step is adding the postgresql.org repository.<\/p>\n
\n$ [root@patroni-01 ~]# dnf install https:\/\/download.postgresql.org\/pub\/repos\/yum\/reporpms\/EL-8-x86_64\/pgdg-redhat-repo-latest.noarch.rpm\n$ Last metadata expiration check: 1:49:40 ago on Fri 04 Mar 2022 12:53:22 PM CET.\n$ pgdg-redhat-repo-latest.noarch.rpm 13 kB\/s | 12 kB 00:00\n$ Dependencies resolved.\n$ ==========================================================================================================================================\n$ Package Architecture Version Repository Size\n$ ==========================================================================================================================================\n$ Installing:\n$ pgdg-redhat-repo noarch 42.0-23 @commandline 12 k\n$ \n$ Transaction Summary\n$ ==========================================================================================================================================\n$ Install 1 Package\n$ \n$ Total size: 12 k\n$ Installed size: 12 k\n$ Is this ok [y\/N]: y\n$ Downloading Packages:\n$ Running transaction check\n$ Transaction check succeeded.\n$ Running transaction test\n$ Transaction test succeeded.\n$ Running transaction\n$ Preparing : 1\/1\n$ Installing : pgdg-redhat-repo-42.0-23.noarch 1\/1\n$ Verifying : pgdg-redhat-repo-42.0-23.noarch 1\/1\n$ \n$ Installed:\n$ pgdg-redhat-repo-42.0-23.noarch\n$ \n$ Complete!\n$ [root@patroni-01 ~]#\n<\/pre>\nAs written in the beginning, Consul will be part of a Patroni based HA Cluster, so I install all needed packages.
\nBut first I edit the pgdg repo file to enable PostgreSQL 14 only and disable all other versions.<\/p>\n\n[root@patroni-01 ~]# cat \/etc\/yum.repos.d\/pgdg-redhat-all.repo\n#######################################################\n# PGDG Red Hat Enterprise Linux \/ CentOS repositories #\n#######################################################\n\n# PGDG Red Hat Enterprise Linux \/ CentOS stable common repository for all PostgreSQL versions\n\n[pgdg-common]\nname=PostgreSQL common RPMs for RHEL\/CentOS $releasever - $basearch\nbaseurl=https:\/\/download.postgresql.org\/pub\/repos\/yum\/common\/redhat\/rhel-$releasever-$basearch\nenabled=1\ngpgcheck=1\ngpgkey=file:\/\/\/etc\/pki\/rpm-gpg\/RPM-GPG-KEY-PGDG\nrepo_gpgcheck = 1\n\n# Red Hat recently breaks compatibility between 8.n and 8.n+1. PGDG repo is\n# affected with the LLVM repo. This is a band aid repo for the llvmjit users\n# whose installations cannot be updated.\n\n[pgdg-centos8-sysupdates]\nname=PostgreSQL Supplementary ucommon RPMs for RHEL\/CentOS $releasever - $basearch\nbaseurl=https:\/\/download.postgresql.org\/pub\/repos\/yum\/common\/pgdg-centos8-sysupdates\/redhat\/rhel-$releasever-$basearch\nenabled=0\ngpgcheck=1\ngpgkey=file:\/\/\/etc\/pki\/rpm-gpg\/RPM-GPG-KEY-PGDG\nrepo_gpgcheck = 1\n\n# PGDG Red Hat Enterprise Linux \/ CentOS stable repositories:\n\n[pgdg14]\nname=PostgreSQL 14 for RHEL\/CentOS $releasever - $basearch\nbaseurl=https:\/\/download.postgresql.org\/pub\/repos\/yum\/14\/redhat\/rhel-$releasever-$basearch\nenabled=1\ngpgcheck=1\ngpgkey=file:\/\/\/etc\/pki\/rpm-gpg\/RPM-GPG-KEY-PGDG\nrepo_gpgcheck = 1\n\n[pgdg13]\nname=PostgreSQL 13 for RHEL\/CentOS $releasever - $basearch\nbaseurl=https:\/\/download.postgresql.org\/pub\/repos\/yum\/13\/redhat\/rhel-$releasever-$basearch\nenabled=0\ngpgcheck=1\ngpgkey=file:\/\/\/etc\/pki\/rpm-gpg\/RPM-GPG-KEY-PGDG\nrepo_gpgcheck = 1\n<\/pre>\nSet enabled to 0 for all other version than the one you want to install, in my case only 14 is enabled.<\/p>\n
As preparation for the following operations we need to open ports with firewalld, port 5432 is default PostgreSQL, the others used by consul.<\/p>\n
\n$ [root@patroni-01 ~]# firewall-cmd --add-port={5432,8300,8301,8302,8400,8500,8600}\/tcp --permanent\n$ success\n$ [root@patroni-01 ~]# firewall-cmd --add-port={8301,8302,8600}\/udp --permanent\n$ success\n$ [root@patroni-01 ~]# firewall-cmd --reload\n$ success\n$ [root@patroni-01 ~]#\n$ <\/pre>\nNow it is time to install Consul, as written in the beginning it will be part of a Patroni Cluster, so I install all needed packages in one step.<\/p>\n
\n$ [root@patroni-01 ~]# dnf install consul postgresql14 postgresql14-server postgresql14-contrib haproxy keepalived patroni\n$ PostgreSQL common RPMs for RHEL\/CentOS 8 - x86_64 83 B\/s | 195 B 00:02\n$ PostgreSQL common RPMs for RHEL\/CentOS 8 - x86_64 1.6 MB\/s | 1.7 kB 00:00\n$ Importing GPG key 0x442DF0F8:\n$ Userid : \"PostgreSQL RPM Building Project \"\n$ Fingerprint: 68C9 E2B9 1A37 D136 FE74 D176 1F16 D2E1 442D F0F8\n$ From : \/etc\/pki\/rpm-gpg\/RPM-GPG-KEY-PGDG\n$ Is this ok [y\/N]: y\n$ PostgreSQL common RPMs for RHEL\/CentOS 8 - x86_64 186 kB\/s | 619 kB 00:03\n$ PostgreSQL 14 for RHEL\/CentOS 8 - x86_64 129 B\/s | 195 B 00:01\n$ PostgreSQL 14 for RHEL\/CentOS 8 - x86_64 1.6 MB\/s | 1.7 kB 00:00\n$ Importing GPG key 0x442DF0F8:\n$ Userid : \"PostgreSQL RPM Building Project \"\n$ Fingerprint: 68C9 E2B9 1A37 D136 FE74 D176 1F16 D2E1 442D F0F8\n$ From : \/etc\/pki\/rpm-gpg\/RPM-GPG-KEY-PGDG\n$ Is this ok [y\/N]: y\n$ PostgreSQL 14 for RHEL\/CentOS 8 - x86_64 74 kB\/s | 206 kB 00:02\n$ Dependencies resolved.\n$ ===========================================================================================================================\n$ Package Architecture Version Repository Size\n$ ===========================================================================================================================\n$ Installing:\n$ consul x86_64 1.10.3-1.rhel8 pgdg-common 16 M\n$ haproxy x86_64 1.8.27-2.el8 appstream 1.4 M\n$ keepalived x86_64 2.1.5-6.el8 appstream 535 k\n$ patroni x86_64 2.1.3-1.rhel8 pgdg-common 863 k\n$ postgresql14 x86_64 14.2-1PGDG.rhel8 pgdg14 1.5 M\n$ postgresql14-contrib x86_64 14.2-1PGDG.rhel8 pgdg14 723 k\n$ postgresql14-server x86_64 14.2-1PGDG.rhel8 pgdg14 5.7 M\n$ Installing dependencies:\n$ libicu x86_64 60.3-2.el8_1 baseos 8.8 M\n$ lm_sensors-libs x86_64 3.4.0-23.20180522git70f7e08.el8 baseos 58 k\n$ lz4 x86_64 1.8.3-3.el8_4 baseos 102 k\n$ mariadb-connector-c x86_64 3.1.11-2.el8_3 appstream 199 k\n$ mariadb-connector-c-config noarch 3.1.11-2.el8_3 appstream 14 k\n$ net-snmp-agent-libs x86_64 1:5.8-22.el8 appstream 747 k\n$ net-snmp-libs x86_64 1:5.8-22.el8 baseos 826 k\n$ perl-Carp noarch 1.42-396.el8 baseos 29 k\n$ perl-Data-Dumper x86_64 2.167-399.el8 baseos 57 k\n$ perl-Digest noarch 1.17-395.el8 appstream 26 k\n$ perl-Digest-MD5 x86_64 2.55-396.el8 appstream 36 k\n$ perl-Encode x86_64 4:2.97-3.el8 baseos 1.5 M\n$ perl-Errno x86_64 1.28-420.el8 baseos 75 k\n$ perl-Exporter noarch 5.72-396.el8 baseos 33 k\n$ perl-File-Path noarch 2.15-2.el8 baseos 37 k\n$ perl-File-Temp noarch 0.230.600-1.el8 baseos 62 k\n$ perl-Getopt-Long noarch 1:2.50-4.el8 baseos 62 k\n$ perl-HTTP-Tiny noarch 0.074-1.el8 baseos 57 k\n$ perl-IO x86_64 1.38-420.el8 baseos 141 k\n$ perl-MIME-Base64 x86_64 3.15-396.el8 baseos 30 k\n$ perl-Net-SSLeay x86_64 1.88-1.module+el8.4.0+512+d4f0fc54 appstream 378 k\n$ perl-PathTools x86_64 3.74-1.el8 baseos 89 k\n$ perl-Pod-Escapes noarch 1:1.07-395.el8 baseos 19 k\n$ perl-Pod-Perldoc noarch 3.28-396.el8 baseos 85 k\n$ perl-Pod-Simple noarch 1:3.35-395.el8 baseos 212 k\n$ perl-Pod-Usage noarch 4:1.69-395.el8 baseos 33 k\n$ perl-Scalar-List-Utils x86_64 3:1.49-2.el8 baseos 67 k\n$ perl-Socket x86_64 4:2.027-3.el8 baseos 58 k\n$ perl-Storable x86_64 1:3.11-3.el8 baseos 97 k\n$ perl-Term-ANSIColor noarch 4.06-396.el8 baseos 45 k\n$ perl-Term-Cap noarch 1.17-395.el8 baseos 22 k\n$ perl-Text-ParseWords noarch 3.30-395.el8 baseos 17 k\n$ perl-Text-Tabs+Wrap noarch 2013.0523-395.el8 baseos 23 k\n$ perl-Time-Local noarch 1:1.280-1.el8 baseos 32 k\n$ perl-URI noarch 1.73-3.el8 appstream 115 k\n$ perl-Unicode-Normalize x86_64 1.25-396.el8 baseos 81 k\n$ perl-constant noarch 1.33-396.el8 baseos 24 k\n$ perl-interpreter x86_64 4:5.26.3-420.el8 baseos 6.3 M\n$ perl-libnet noarch 3.11-3.el8 appstream 120 k\n$ perl-libs x86_64 4:5.26.3-420.el8 baseos 1.6 M\n$ perl-macros x86_64 4:5.26.3-420.el8 baseos 71 k\n$ perl-parent noarch 1:0.237-1.el8 baseos 19 k\n$ perl-podlators noarch 4.11-1.el8 baseos 117 k\n$ perl-threads x86_64 1:2.21-2.el8 baseos 60 k\n$ perl-threads-shared x86_64 1.58-2.el8 baseos 47 k\n$ postgresql14-libs x86_64 14.2-1PGDG.rhel8 pgdg14 275 k\n$ python3-cdiff noarch 1.0-1.rhel8 pgdg-common 30 k\n$ python3-click noarch 6.7-8.el8 appstream 130 k\n$ python3-pip noarch 9.0.3-20.el8.rocky.0 appstream 19 k\n$ python3-prettytable noarch 0.7.2-14.el8 appstream 43 k\n$ python3-psutil x86_64 5.4.3-11.el8 appstream 372 k\n$ python3-psycopg2 x86_64 2.8.6-1.rhel8 pgdg-common 178 k\n$ python3-pyyaml x86_64 3.12-12.el8 baseos 192 k\n$ python3-setuptools noarch 39.2.0-6.el8 baseos 162 k\n$ python3-ydiff noarch 1.2-10.rhel8 pgdg-common 30 k\n$ python36 x86_64 3.6.8-38.module+el8.5.0+671+195e4563 appstream 18 k\n$ Installing weak dependencies:\n$ perl-IO-Socket-IP noarch 0.39-5.el8 appstream 46 k\n$ perl-IO-Socket-SSL noarch 2.066-4.module+el8.4.0+512+d4f0fc54 appstream 297 k\n$ perl-Mozilla-CA noarch 20160104-7.module+el8.4.0+529+e3b3e624 appstream 14 k\n$ Enabling module streams:\n$ perl 5.26\n$ perl-IO-Socket-SSL 2.066\n$ perl-libwww-perl 6.34\n$ python36 3.6\n$ \n$ Transaction Summary\n$ ===========================================================================================================================\n$ Install 66 Packages\n$ \n$ Total download size: 51 M\n$ Installed size: 203 M\n$ Is this ok [y\/N]:\n<\/pre>\nWith installation out of the postgresql.org repository also user postgres and group postgres are created.<\/p>\n
I want Consul also to run as postgres user, for this we need to adapt User and Group within the service file.
\nThe service file is located at \/usr\/lib\/systemd\/system\/consul.service.<\/p>\n\n[root@patroni-01 ~]# cat \/usr\/lib\/systemd\/system\/consul.service\n[Unit]\nDescription=Consul is a tool for service discovery and configuration. Consul is distributed, highly available, and extremely scalable.\nDocumentation=http:\/\/www.consul.io\nAfter=network-online.target\nWants=network-online.target\n\n[Service]\nUser=postgres\nGroup=postgres\nEnvironmentFile=-\/etc\/sysconfig\/consul\nExecStart=\/usr\/bin\/consul $CMD_OPTS\nExecReload=\/bin\/kill -HUP $MAINPID\nKillSignal=SIGINT\nRestart=on-failure\n\n[Install]\nWantedBy=multi-user.target\n[root@patroni-01 ~]#\n<\/pre>\nNext step is adapting the Consul environment file, I want the Consul data directory within \/pgdata.
\nThe environment file is located at \/etc\/sysconfig\/consul.<\/p>\n\n[root@patroni-01 ~]# cat \/etc\/sysconfig\/consul\nCMD_OPTS=\"agent -config-dir=\/etc\/consul.d -data-dir=\/pgdata\/consul\"\n#GOMAXPROCS=4\n[root@patroni-01 ~]#\n<\/pre>\nCreating Consul data directory.<\/p>\n
\n$ [root@patroni-01 ~]# mkdir \/pgdata\/consul\n$ [root@patroni-01 ~]# chown -R postgres:postgres \/pgdata\/\n<\/pre>\nAnd the Consul key.<\/p>\n
\n$ [root@patroni-01 ~]# consul keygen\n$ 5mSUIrSSXp+usVR1qqM68CD2lnFLaTcg4G48l9zJhqE=\n$ [root@patroni-01 ~]#\n<\/pre>\nNow it is time to adapt the Consul configuration file on each node.
\nNode patroni-01:<\/p>\n\n[root@patroni-01 ~]# cat \/etc\/consul.d\/consul.json-dist.hcl\n{\n \"server\": true,\n \"data_dir\": \"\/pgdata\/consul\",\n \"log_level\": \"INFO\"\n \"disable_update_check\": true,\n \"disable_anonymous_signature\": true,\n \"advertise_addr\": \"192.168.198.132\",\n \"bind_addr\": \"192.168.198.132\",\n \"bootstrap_expect\": 3,\n \"client_addr\": \"0.0.0.0\",\n \"domain\": \"patroni.test\",\n \"enable_script_checks\": true,\n \"dns_config\": {\n \"enable_truncate\": true,\n \"only_passing\": true\n },\n \"enable_syslog\": true,\n \"encrypt\": \"5mSUIrSSXp+usVR1qqM68CD2lnFLaTcg4G48l9zJhqE=\",\n \"leave_on_terminate\": true,\n \"log_level\": \"INFO\",\n \"rejoin_after_leave\": true,\n \"retry_join\": [\n \"patroni-01\",\n \"patroni-02\",\n \"patroni-03\"\n ],\n \"server\": true,\n \"start_join\": [\n \"patroni-01\",\n \"patroni-02\",\n \"patroni-03\"\n ],\n \"ui_config.enabled\": true\n}\n[root@patroni-01 ~]#\n<\/pre>\nNode patroni-02:<\/p>\n
\n[root@patroni-02 ~]# cat \/etc\/consul.d\/consul.json-dist.hcl\n{\n \"server\": true,\n \"data_dir\": \"\/pgdata\/consul\",\n \"log_level\": \"INFO\"\n \"disable_update_check\": true,\n \"disable_anonymous_signature\": true,\n \"advertise_addr\": \"192.168.198.133\",\n \"bind_addr\": \"192.168.198.133\",\n \"bootstrap_expect\": 3,\n \"client_addr\": \"0.0.0.0\",\n \"domain\": \"patroni.test\",\n \"enable_script_checks\": true,\n \"dns_config\": {\n \"enable_truncate\": true,\n \"only_passing\": true\n },\n \"enable_syslog\": true,\n \"encrypt\": \"5mSUIrSSXp+usVR1qqM68CD2lnFLaTcg4G48l9zJhqE=\",\n \"leave_on_terminate\": true,\n \"log_level\": \"INFO\",\n \"rejoin_after_leave\": true,\n \"retry_join\": [\n \"patroni-01\",\n \"patroni-02\",\n \"patroni-03\"\n ],\n \"server\": true,\n \"start_join\": [\n \"patroni-01\",\n \"patroni-02\",\n \"patroni-03\"\n ],\n \"ui_config.enabled\": true\n}\n[root@patroni-02 ~]#\n<\/pre>\nNode patroni-03:<\/p>\n
\n[root@patroni-03 ~]# cat \/etc\/consul.d\/consul.json-dist.hcl\n{\n \"server\": true,\n \"data_dir\": \"\/pgdata\/consul\",\n \"log_level\": \"INFO\"\n \"disable_update_check\": true,\n \"disable_anonymous_signature\": true,\n \"advertise_addr\": \"192.168.198.134\",\n \"bind_addr\": \"192.168.198.134\",\n \"bootstrap_expect\": 3,\n \"client_addr\": \"0.0.0.0\",\n \"domain\": \"patroni.test\",\n \"enable_script_checks\": true,\n \"dns_config\": {\n \"enable_truncate\": true,\n \"only_passing\": true\n },\n \"enable_syslog\": true,\n \"encrypt\": \"5mSUIrSSXp+usVR1qqM68CD2lnFLaTcg4G48l9zJhqE=\",\n \"leave_on_terminate\": true,\n \"log_level\": \"INFO\",\n \"rejoin_after_leave\": true,\n \"retry_join\": [\n \"patroni-01\",\n \"patroni-02\",\n \"patroni-03\"\n ],\n \"server\": true,\n \"start_join\": [\n \"patroni-01\",\n \"patroni-02\",\n \"patroni-03\"\n ],\n \"ui_config.enabled\": true\n}\n[root@patroni-03 ~]#\n<\/pre>\nAnd make the files accessable for the postgres user.<\/p>\n
\n$ [root@patroni-01 ~]# chown -R postgres:postgres \/etc\/consul.d\/\n<\/pre>\nNow it is time to start Consul on each node.<\/p>\n
\n$ [root@patroni-01 ~]# systemctl start consul\n<\/pre>\nChecking the status.<\/p>\n
\n[root@patroni-01 ~]# consul members\n$ Node Address Status Type Build Protocol DC Segment\n$ patroni-01.patroni.test 192.168.198.132:8301 alive server 1.10.3 2 dc1 \n$ patroni-02.patroni.test 192.168.198.133:8301 alive server 1.10.3 2 dc1 \n$ patroni-03.patroni.test 192.168.198.134:8301 alive server 1.10.3 2 dc1 \n$ [root@patroni-01 ~]#\n<\/pre>\nSometimes it happens that Consul autojoin has issues, in this case manual join helps.<\/p>\n
\n$ [root@patroni-01 ~]# consul join 192.168.198.132 192.168.198.133 192.168.198.134\n$ Successfully joined cluster by contacting 3 nodes.\n$ [root@patroni-01 ~]# consul members\n$ Node Address Status Type Build Protocol DC Segment\n$ patroni-01.patroni.test 192.168.198.132:8301 alive server 1.10.3 2 dc1 \n$ patroni-02.patroni.test 192.168.198.133:8301 alive server 1.10.3 2 dc1 \n$ patroni-03.patroni.test 192.168.198.134:8301 alive server 1.10.3 2 dc1 \n$ [root@patroni-01 ~]#\n<\/pre>\nThat was the first part of a Patroni HA Setup using Consul instead of ETCD.<\/p>\n","protected":false},"excerpt":{"rendered":"
This blog describes the setup of a Consul Cluster on RHEL 8 and clones, it will be the base for a Patroni HA setup using RPM Packages from postgresql.org. Many Patroni setups are using ETCD, but ETCD is not available as RPM out of the box for RHEL 8 and clones, and in many cases […]<\/p>\n","protected":false},"author":28,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229,42,83],"tags":[2509,84,101,73,2602],"type_dbi":[],"class_list":["post-17146","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","category-operating-systems","category-postgresql","tag-consul","tag-high-availability","tag-installation","tag-linux","tag-postgresql-2"],"acf":[],"yoast_head":"\n
How to setup a Consul Cluster on RHEL 8, Rocky Linux 8, AlmaLinux 8 part 1 - dbi Blog<\/title>\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.dbi-services.com\/blog\/how-to-setup-a-consul-cluster-on-rhel-8-rocky-linux-8-almalinux-8\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to setup a Consul Cluster on RHEL 8, Rocky Linux 8, AlmaLinux 8 part 1\" \/>\n<meta property=\"og:description\" content=\"This blog describes the setup of a Consul Cluster on RHEL 8 and clones, it will be the base for a Patroni HA setup using RPM Packages from postgresql.org. 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