Category: Linux

Deploy PostgreSQL HA (Patroni, etcd, HAproxy) on Ubuntu servers using Ansible

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Deploy PostgreSQL HA (Patroni, etcd, HAproxy) on Ubuntu servers using Ansible Architecture Verify commands #etcd etcdctl --endpoints=http://10.10.10.111:2379,http://10.10.10.112:2379,http://10.10.10.113:2379 member list etcdctl --endpoints=http://10.10.10.111:2379,http://10.10.10.112:2379,http://10.10.10.113:2379 endpoint health etcdctl --endpoints=http://10.10.10.111:2379,http://10.10.10.112:2379,http://10.10.10.113:2379 endpoint status #patroni patronictl -c /etc/patroni/patroni.yml topology ls /var/lib/postgresql/18/main -l /usr/lib/postgresql/18/bin/pg_controldata /var/lib/postgresql/18/main #haproxy watch 'echo "show stat" | nc -U /var/lib/haproxy/stats | cut -d "," -f 1,2,5-11,18,24,27,30,36,50,37,56,57,62 | column -s,… Continue reading Deploy PostgreSQL HA (Patroni, etcd, HAproxy) on Ubuntu servers using Ansible →

Nextcloud - Upgrading PostgreSQL database running as Docker container from 17 to 18

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Append YAML file with docker-compose definition for new PostgreSQL 18 database:   nextcloud-postgres18:     container_name: nextcloud-postgres18     hostname: nextcloud-postgres18     image: postgres:18-alpine     restart: always     volumes:       - /data/nextcloud-postgresql18-data64:/var/lib/postgresql     environment:       - POSTGRES_PASSWORD=       - POSTGRES_DB=nextcloud       - POSTGRES_USER=nextcloud… Continue reading Nextcloud - Upgrading PostgreSQL database running as Docker container from 17 to 18 →

Tune PostgreSQL and PHP settings for Nextcloud inside Docker container on RPi 5

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Tune PostgreSQL and PHP settings for Nextcloud inside Docker container on RPi 5 PostgreSQL settings change variables inside PG_DATA/postgresql.conf config file shared_buffers = 256MB work_mem = 8MB restart PostgreSQL database: docker restart nextcloud-postgres verify: docker exec -it nextcloud-postgres psql -U nextcloud -d nextcloud -c "SHOW shared_buffers" docker exec -it nextcloud-postgres psql -U nextcloud -d nextcloud… Continue reading Tune PostgreSQL and PHP settings for Nextcloud inside Docker container on RPi 5 →

Generic HA Architecture - App servers + PostgreSQL Patroni cluster

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Generic HA Architecture - App servers + PostgreSQL Patroni cluster Keepalived + HAproxy used as Load Balancers   Key components: HAproxy - TCP/HTTP Load Balancer Keepalived - Virtual IP for HAproxy Patroni - HA template for PostgreSQL database (cluster with streaming replication) etcd - Distributed Configuration Store for Patroni   Architecture diagram: