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diff --git a/content/blog/nix/migrating-eventline.md b/content/blog/nix/migrating-eventline.md new file mode 100644 index 0000000..0162bd7 --- /dev/null +++ b/content/blog/nix/migrating-eventline.md @@ -0,0 +1,166 @@ +--- +title: Migrating eventline to nixos +description: How I migrated my eventline installation to nixos +date: 2024-03-22 +tags: +- eventline +- nix +--- + +## Introduction + +I am migrating several services from a FreeBSD server to a nixos server. Here is how I performed the operation for [eventline](https://www.exograd.com/products/eventline/). + +## Eventline on nixos + +Eventline is not packaged on nixos, so that might be a good project to try and tackle in the near future. In the meantime I used the container image. + +Here is the module I wrote to deploy an eventline container, configure postgresql and borg backups: +```nix +{ config, lib, pkgs, ... }: +{ + imports = [ + ../../lib/postgresql.nix + ]; + environment.etc = { + "borg-eventline-db.key" = { + mode = "0400"; + source = ./borg-db.key; + }; + "eventline.yaml" = { + mode = "0400"; + source = ./eventline.yaml; + uid = 1000; + }; + "eventline-entrypoint" = { + mode = "0500"; + source = ./eventline-entrypoint; + uid = 1000; + }; + }; + services = { + borgbackup.jobs = let defaults = { + compression = "auto,zstd"; + doInit = true; + encryption.mode = "none"; + prune.keep = { + daily = 14; + weekly = 4; + monthly = 3; + }; + startAt = "daily"; + }; in { + "eventline-db" = defaults // { + environment.BORG_RSH = "ssh -i /etc/borg-eventline-db.key"; + paths = "/tmp/eventline.sql"; + postHook = "rm -f /tmp/eventline.sql"; + preHook = ''rm -f /tmp/eventline.sql; /run/current-system/sw/bin/pg_dump -h localhost -U eventline -d eventline > /tmp/eventline.sql''; + repo = "ssh://borg@gcp.adyxax.org/srv/borg/eventline-db"; + }; + }; + nginx.virtualHosts = let + headersSecure = '' + # A+ on https://securityheaders.io/ + add_header X-Frame-Options deny; + add_header X-XSS-Protection "1; mode=block"; + add_header X-Content-Type-Options nosniff; + add_header Referrer-Policy strict-origin; + add_header Cache-Control no-transform; + add_header Content-Security-Policy "script-src 'self'"; + add_header Permissions-Policy "accelerometer=(), camera=(), geolocation=(), gyroscope=(), magnetometer=(), microphone=(), payment=(), usb=()"; + # 6 months HSTS pinning + add_header Strict-Transport-Security max-age=16000000; + ''; + headersStatic = headersSecure + '' + add_header Cache-Control "public, max-age=31536000, immutable"; + ''; + in { + "eventline.adyxax.org" = { + forceSSL = true; + locations = { + "/" = { + extraConfig = headersSecure; + proxyPass = "http://127.0.0.1:8087"; + }; + }; + sslCertificate = "/etc/nginx/adyxax.org.crt"; + sslCertificateKey = "/etc/nginx/adyxax.org.key"; + }; + "eventline-api.adyxax.org" = { + locations = { + "/" = { + extraConfig = headersSecure; + proxyPass = "http://127.0.0.1:8085"; + }; + }; + onlySSL = true; + sslCertificate = "/etc/nginx/adyxax.org.crt"; + sslCertificateKey = "/etc/nginx/adyxax.org.key"; + }; + }; + postgresql = { + ensureDatabases = ["eventline"]; + ensureUsers = [{ + name = "eventline"; + ensureDBOwnership = true; + }]; + }; + }; + virtualisation.oci-containers.containers = { + eventline = { + image = "exograd/eventline:1.1.0"; + ports = [ + "127.0.0.1:8085:8085" # api + "127.0.0.1:8087:8087" # web + ]; + user = "root:root"; + volumes = [ + "/etc/eventline.yaml:/etc/eventline/eventline.yaml:ro" + "/etc/eventline-entrypoint:/usr/bin/entrypoint:ro" + ]; + }; + }; +} +``` + +## Dependencies + +The dependencies are mostly the same as in [my article about vaultwarden migration]({{< ref "migrating-vaultwarden.md" >}}#dependencies). One key difference is that there are two nginx virtual hosts and a bunch of files I need for eventline. + +## Migration process + +The first step is obviously to deploy this new configuration to the server, then I need to login and manually restore the backups. +```sh +make run host=dalinar.adyxax.org +``` + +The container will be failing because no password is set on the database user yet, so I stop it: +```sh +systemctl stop podman-eventline +``` + +There is only one backup job for eventline and it holds a dump of the database: +```sh +export BORG_RSH="ssh -i /etc/borg-eventline-db.key" +borg list ssh://borg@gcp.adyxax.org/srv/borg/eventline-db +borg extract ssh://borg@gcp.adyxax.org/srv/borg/eventline-db::dalinar-eventline-db-2023-11-20T00:00:01 +psql -h localhost -U postgres -d eventline +``` + +Restoring the data itself is done with the psql shell: +```sql +ALTER USER eventline WITH PASSWORD 'XXXXXX'; +\i tmp/eventline.sql +``` + +Afterwards I clean up the database dump and restart eventline: +```sh +rm -rf tmp/ +systemctl start podman-eventline +``` + +To wrap this up I migrate the DNS records to the new host, update my monitoring system and clean up the jail on the FreeBSD server. + +## Conclusion + +I did all this in november, I still have quite the backlog of articles to write about nix! |