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|
{ lib, pkgs, ... }:
let
inherit (import ../ssh-keys.nix pkgs) snakeOilPrivateKey snakeOilPublicKey;
backupPath = "/var/lib/pgbackrest";
in
{
name = "pgbackrest-posix";
nodes.primary =
{
pkgs,
...
}:
{
services.openssh.enable = true;
users.users.postgres.openssh.authorizedKeys.keys = [
snakeOilPublicKey
];
services.postgresql = {
enable = true;
initialScript = pkgs.writeText "init.sql" ''
CREATE TABLE t(c text);
INSERT INTO t VALUES ('hello world');
'';
# To make sure we're waiting for read-write after recovery.
ensureUsers = [
{
name = "app-user";
ensureClauses.login = true;
}
];
};
services.pgbackrest = {
enable = true;
repos.backup = {
type = "posix";
path = backupPath;
host-user = "pgbackrest";
};
};
};
nodes.backup =
{
nodes,
...
}:
{
services.openssh.enable = true;
users.users.pgbackrest.openssh.authorizedKeys.keys = [
snakeOilPublicKey
];
services.pgbackrest = {
enable = true;
repos.localhost.path = backupPath;
stanzas.default = {
jobs.future = {
schedule = "3000-01-01";
type = "full";
};
instances.primary = {
path = nodes.primary.services.postgresql.dataDir;
user = "postgres";
};
};
# Examples from https://pgbackrest.org/configuration.html#introduction
# Not used for the test, except for dumping the config.
stanzas.config-format.settings = {
start-fast = true;
compress-level = 3;
buffer-size = "2MiB";
db-timeout = 600;
db-exclude = [
"db1"
"db2"
"db5"
];
tablespace-map = {
ts_01 = "/db/ts_01";
ts_02 = "/db/ts_02";
};
};
};
};
testScript =
{ nodes, ... }:
''
start_all()
primary.wait_for_unit("multi-user.target")
backup.wait_for_unit("multi-user.target")
with subtest("config file is written correctly"):
from textwrap import dedent
have = backup.succeed("cat /etc/pgbackrest/pgbackrest.conf")
want = dedent("""\
[config-format]
buffer-size=2MiB
compress-level=3
db-exclude=db1
db-exclude=db2
db-exclude=db5
db-timeout=600
start-fast=y
tablespace-map=ts_01=/db/ts_01
tablespace-map=ts_02=/db/ts_02
""")
assert want in have, repr((want, have))
primary.log(primary.succeed("""
HOME="${nodes.primary.services.postgresql.dataDir}"
mkdir -m 700 -p ~/.ssh
cat ${snakeOilPrivateKey} > ~/.ssh/id_ecdsa
chmod 400 ~/.ssh/id_ecdsa
ssh-keyscan backup >> ~/.ssh/known_hosts
chown -R postgres:postgres ~/.ssh
"""))
backup.log(backup.succeed("""
HOME="${backupPath}"
mkdir -m 700 -p ~/.ssh
cat ${snakeOilPrivateKey} > ~/.ssh/id_ecdsa
chmod 400 ~/.ssh/id_ecdsa
ssh-keyscan primary >> ~/.ssh/known_hosts
chown -R pgbackrest:pgbackrest ~
"""))
with subtest("backup/restore works with remote instance/local repo (SSH)"):
backup.succeed("sudo -u pgbackrest pgbackrest --stanza=default stanza-create")
backup.succeed("sudo -u pgbackrest pgbackrest --stanza=default check")
backup.systemctl("start pgbackrest-default-future")
# corrupt cluster
primary.systemctl("stop postgresql")
primary.execute("rm ${nodes.primary.services.postgresql.dataDir}/global/pg_control")
primary.succeed("sudo -u postgres pgbackrest --stanza=default restore --delta")
primary.systemctl("start postgresql")
primary.wait_for_unit("postgresql.target")
assert "hello world" in primary.succeed("sudo -u postgres psql -c 'TABLE t;'")
'';
}
|
