nixpkgs/nixos/modules/services/databases/mysql.nix

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{ config, pkgs, ... }:
with pkgs.lib;
let
cfg = config.services.mysql;
mysql = cfg.package;
is55 = mysql.mysqlVersion == "5.5";
mysqldDir = if is55 then "${mysql}/bin" else "${mysql}/libexec";
pidFile = "${cfg.pidDir}/mysqld.pid";
mysqldOptions =
"--user=${cfg.user} --datadir=${cfg.dataDir} --basedir=${mysql} " +
"--pid-file=${pidFile}";
myCnf = pkgs.writeText "my.cnf"
''
[mysqld]
${optionalString (cfg.replication.role == "master" || cfg.replication.role == "slave") "log-bin=mysql-bin"}
${optionalString (cfg.replication.role == "master" || cfg.replication.role == "slave") "server-id = ${toString cfg.replication.serverId}"}
${optionalString (cfg.replication.role == "slave" && !is55)
''
master-host = ${cfg.replication.masterHost}
master-user = ${cfg.replication.masterUser}
master-password = ${cfg.replication.masterPassword}
master-port = ${toString cfg.replication.masterPort}
''}
${cfg.extraOptions}
'';
in
{
###### interface
options = {
services.mysql = {
enable = mkOption {
default = false;
description = "
Whether to enable the MySQL server.
";
};
package = mkOption {
type = types.package;
example = literalExample "pkgs.mysql";
description = "
Which MySQL derivation to use.
";
};
port = mkOption {
default = "3306";
description = "Port of MySQL";
};
user = mkOption {
default = "mysql";
description = "User account under which MySQL runs";
};
dataDir = mkOption {
default = "/var/mysql"; # !!! should be /var/db/mysql
description = "Location where MySQL stores its table files";
};
pidDir = mkOption {
default = "/var/run/mysql";
description = "Location of the file which stores the PID of the MySQL server";
};
extraOptions = mkOption {
default = "";
example = ''
key_buffer_size = 6G
table_cache = 1600
log-error = /var/log/mysql_err.log
'';
description = ''
Provide extra options to the MySQL configuration file.
Please note, that these options are added to the
<literal>[mysqld]</literal> section so you don't need to explicitly
state it again.
'';
};
initialDatabases = mkOption {
default = [];
description = "List of database names and their initial schemas that should be used to create databases on the first startup of MySQL";
example = [
{ name = "foodatabase"; schema = literalExample "./foodatabase.sql"; }
{ name = "bardatabase"; schema = literalExample "./bardatabase.sql"; }
];
};
initialScript = mkOption {
default = null;
description = "A file containing SQL statements to be executed on the first startup. Can be used for granting certain permissions on the database";
};
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# FIXME: remove this option; it's a really bad idea.
rootPassword = mkOption {
default = null;
description = "Path to a file containing the root password, modified on the first startup. Not specifying a root password will leave the root password empty.";
};
replication = {
role = mkOption {
default = "none";
description = "Role of the MySQL server instance. Can be either: master, slave or none";
};
serverId = mkOption {
default = 1;
description = "Id of the MySQL server instance. This number must be unique for each instance";
};
masterHost = mkOption {
description = "Hostname of the MySQL master server";
};
masterUser = mkOption {
description = "Username of the MySQL replication user";
};
masterPassword = mkOption {
description = "Password of the MySQL replication user";
};
masterPort = mkOption {
default = 3306;
description = "Port number on which the MySQL master server runs";
};
};
};
};
###### implementation
config = mkIf config.services.mysql.enable {
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users.extraUsers.mysql = {
description = "MySQL server user";
group = "mysql";
uid = config.ids.uids.mysql;
};
users.extraGroups.mysql.gid = config.ids.gids.mysql;
environment.systemPackages = [mysql];
systemd.services.mysql =
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{ description = "MySQL Server";
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wantedBy = [ "multi-user.target" ];
unitConfig.RequiresMountsFor = "${cfg.dataDir}";
preStart =
''
if ! test -e ${cfg.dataDir}/mysql; then
mkdir -m 0700 -p ${cfg.dataDir}
chown -R ${cfg.user} ${cfg.dataDir}
${mysql}/bin/mysql_install_db ${mysqldOptions}
touch /tmp/mysql_init
fi
mkdir -m 0700 -p ${cfg.pidDir}
chown -R ${cfg.user} ${cfg.pidDir}
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'';
serviceConfig.ExecStart = "${mysqldDir}/mysqld --defaults-extra-file=${myCnf} ${mysqldOptions}";
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postStart =
''
# Wait until the MySQL server is available for use
count=0
while [ ! -e /tmp/mysql.sock ]
do
if [ $count -eq 30 ]
then
echo "Tried 30 times, giving up..."
exit 1
fi
echo "MySQL daemon not yet started. Waiting for 1 second..."
count=$((count++))
sleep 1
done
if [ -f /tmp/mysql_init ]
then
${concatMapStrings (database:
''
# Create initial databases
if ! test -e "${cfg.dataDir}/${database.name}"; then
echo "Creating initial database: ${database.name}"
( echo "create database ${database.name};"
echo "use ${database.name};"
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if [ -f "${database.schema}" ]
then
cat ${database.schema}
elif [ -d "${database.schema}" ]
then
cat ${database.schema}/mysql-databases/*.sql
fi
) | ${mysql}/bin/mysql -u root -N
fi
'') cfg.initialDatabases}
${optionalString (cfg.replication.role == "slave" && is55)
''
# Set up the replication master
( echo "stop slave;"
echo "change master to master_host='${cfg.replication.masterHost}', master_user='${cfg.replication.masterUser}', master_password='${cfg.replication.masterPassword}';"
echo "start slave;"
) | ${mysql}/bin/mysql -u root -N
''}
${optionalString (cfg.initialScript != null)
''
# Execute initial script
cat ${cfg.initialScript} | ${mysql}/bin/mysql -u root -N
''}
${optionalString (cfg.rootPassword != null)
''
# Change root password
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( echo "use mysql;"
echo "update user set Password=password('$(cat ${cfg.rootPassword})') where User='root';"
echo "flush privileges;"
) | ${mysql}/bin/mysql -u root -N
''}
rm /tmp/mysql_init
fi
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''; # */
};
};
}