Helix Core Server (p4d) Reference

Start the Perforce service, perform checkpoint/journaling, or do certain system administration tasks.

Syntax

p4d [ options ]
p4d.exe [ options ]
p4s.exe [ options ]
p4d -j? [[ -z | -Z ]] [ args ... ]
p4d [-z] -R service -jr file 
p4d [-z] [-R service | -P server-id] -jd file  
p4d -Fm | Fs

Description

p4d [ options ] p4d.exe [ options ] p4s.exe [ options ]	invoke the background process that manages the Helix Server versioning service
p4d -j? [ -z \| -Z ] [ args ... ]	for certain system administration tasks, including some that are related to checkpointing and journaling. See Checkpoint files.
p4d -Fm \| Fs	Failback options

Note

Rotating the journal means saving the existing journal and creating a new, empty journal for future transactions.

"Truncating" a journal refers to the new journal file starting out as an empty file.

On UNIX and Mac OS X, the executable is p4d.

On Windows, the executable is p4d.exe (running as a server) or p4s.exe (running as a service).

Parallel checkpointing, dumping and recovery

The p suboption to -jc, -jd and -jr allows the use of parallel threads for writing to, and reading from, multiple checkpoint files, one per database table.

For example, to specify 4 parallel threads, use the -N threads option:

$ p4d -r . -N 4 -jcp cp
Checkpointing files to cp.ckp.9154...

$ p4d -r . -N 4 -jrp cp.ckp.9154
Recovering from cp.ckp.9154...

Although the number of parallel threads is typically controlled by the db.checkpoint.threads configurable, the two examples above with -N show that the p4d command line can override that value.

Prefix for parallel checkpoints

Checkpoint files are placed into a newly-created directory based on the prefix for the checkpoint or dump. Specifying a prefix on the p4d -jcp command overrides the the prefix set by the journalPrefix configurable.

Exit Status

After successful startup, p4d does not normally exit. It merely outputs the following startup message:

Perforce server starting...

and runs in the background.

On failed startup, p4d returns a nonzero error code.

Also, if invoked with any of the -j checkpointing or journaling options, p4d exits with a nonzero error code if any error occurs.

Options

This section includes the following types of options: Server options, General options, Checkpoint and journal options, Journal restore options, Replication and multi-server options, Journal dump and restore filtering, Certificate handling, Configuration options and Failback options.

Server options

Server option	Meaning
`-d`	Run as a daemon (in the background).
`-f`	Run as a single-threaded (non-forking) process.
`-i`	Run from `inetd` on UNIX.
`-q`	Run quietly (no startup messages).
`-n`	Start the server in maintenance mode, which means that: the server is only able to perform commands that do not require a client the user and file count restrictions listed in the license file are not enforced
`--pid-file[=file]`	Write the PID of the server to a file named `server.pid` in the directory specified by `P4ROOT`, or write the PID to the file specified by `file`. This makes it easier to identify a server instance among many. The `file` parameter can be a complete path specification. The file does not have to reside in `P4ROOT`.
`--daemonsafe`	Is like `-d` and forks the `p4d` into the background, but also closes the stdio (standard input output) files.
`-xi`	Irreversibly reconfigure the Helix Core Server (and its metadata) to operate in Unicode mode. Do not use this option unless you know you require Unicode mode. For details, see the Release Notes and the Internationalization Notes.
`-xu`	Run database upgrades and quit. Upgrades must be run manually unless the server is a DVCS personal server, which runs upgrade steps automatically. Prepare to run a later major release of the server. See Upgrading the server.
`-xv`	Run low-level database validation and quit. With no table arguments, validates all tables. If one or more table arguments are provided, only the specified tables are validated. For example: `p4d -xv db.rev db.change db.have`
`-xx [-q -o output] [table1 [table2]]`	Check consistency between table pairs, producing a `jnl.fix` file. If table names are specified, only those tables are checked. Check the `jnl.fix` file for accuracy before attempting any updates. To specify a filename other than `jnl.fix`, use the `-o` option. To restrict output to show only inconsistent tables, use the `-q` option. Note The `db.integed`/`db.rev` table pair appears twice in the command output because this table pair check is done in both the `toFile` direction and in the `fromFile` direction. Warning Do not attempt to replay the `jnl.fix` file into your depot without consulting Perforce Support.
`-xvU`	Run fast verification. Do not lock database tables, and verify only that the unlock count for each table is zero.
`-xD [serverID]`	Display (or set) the server’s `serverID` (stored in the `server.id` file) and exit.
-xU CleanServerLocks	Safely cleans up the server locks directory, which can help avoid the possible issue of running out of inodes. (See also the Support Knowledgebase article about possible causes of the message No space left on device.)

General options

General option	Meaning
`-h`, `-?`	Print help message.
`-V`	Print version number, and other information, such as which memory manager the server uses.
`-A auditlog`	Specify an audit log file. Overrides `P4AUDIT` setting. Default is null.
`-Id description`	A server description displayed by the `p4 -z tag info` command. Overrides `P4DESCRIPTION` setting.
`-In name`	A server name for use with `p4 configure`. Overrides `P4NAME` setting. Although this is supported for backward compatibility, an easier method for configuring the server is to use p4 serverid and p4 server.
`-J journal`	Specify a journal file. Overrides `P4JOURNAL` setting. Default is `journal`. (Use `-J off` to disable journaling.)
`-L log`	Specify a log file. Overrides `P4LOG` setting. Default is `STDERR`.
`-p port`	Specify a port to listen to. Overrides `P4PORT`. Default `1666`.
`-r root`	Specify the server root directory. Overrides `P4ROOT`. Default is current working directory.
`-v subsystem=level`	Set debug level. Overrides value `P4DEBUG` setting. Default is null.
`-C1`	Force the service to operate in case-insensitive mode on a normally case-sensitive platform.
`--pid-file[=name]`	Write the server’s PID to the specified file. Default name for the file is `server.pid`.
`--show-realtime`	Display Monitoring the server in real-time monitoring on the command line. For details of this feature, see `p4 monitor realtime` in Helix Core Command-Line (P4) Reference.

Checkpoint and journal options

We assume you have read the Backup procedure topic.

Checkpointing option Meaning

-c command

Lock database tables, run command, unlock the tables, and exit.

-jc [[-Z | -z]] [ prefix ]

Create checkpoint and rotate the journal. Rotating the journal means saving the existing journal and creating a new journal for future transactions.

p4d -jc creates a new checkpoint.n and rotates the current journal to a numbered journal that corresponds to the now previous checkpoint, journal.n-1

In this case, your checkpoint and journal files are named prefix.ckp.n and prefix.jnl.n respectively, where prefix is as specified on the command line and n is a sequence number.

If no prefix is specified, the default file names checkpoint.n and journal.n are used.

Setting the journalPrefix configurable overrides the default prefix and directory location for rotated journals and checkpoints.

You can store checkpoints and journals in the directory of your choice by specifying the directory as part of the prefix.

With -z, both the checkpoint and the journal are compressed.

With -Z, only the checkpoint is compressed. The journal is left uncompressed.

Without -z or -Z, the checkpoint and journal files are not compressed.

-jcp [-Z | -z] [ prefix ]

-jcp -N n [-Z | -z] [ prefix ]

Same as the row above, except with parallel threads. See Parallel checkpointing, dumping and recovery.

-jd [-z] file

Create checkpoint without saving or rotating the journal. With -z, the checkpoint is compressed.

-jdp [-z] file

Create checkpoint with parallel threads. See Parallel checkpointing, dumping and recovery.

[-R service | -P server-id] -jd [-z] file

Similar to -jd [-z] file, but create a checkpoint:

If using -R service	If using -P server-id
appropriate for a server providing the services specified by the `-R service` option, such as `-R commit-server` or `-R edge-server`	with data relevant to the configured server that has the server ID specified using `-P`, which causes a journal header to be written containing the server ID

-jj [-z] [ prefix ]

Rotate the journal, and no checkpointing occurs. Including -z causes the journal to be compressed.

Your journal file is named prefix.jnl.n, where prefix is as specified on the command line and n is a sequence number. If no prefix is specified, the default filename journal.n is used. You can store journals in the directory of your choice by specifying the directory as part of the prefix.

-jv file

Verify the integrity of the checkpoint or journal specified by file as follows:

Can the checkpoint or journal be read from start to finish?
If it is zipped, can it be successfully unzipped?
If it has an MD5 file with its MD5, does it match?
Does it have the expected header and trailer?

This command does not replay the journal.

-z

Compress (in gzip format) checkpoints and journals.

When you use this option with the -jd option, Helix Server automatically adds the .gz extension to the checkpoint file. So, the command:

p4d -jd -z myCheckpoint

creates two files: myCheckpoint.gz and myCheckpoint.md5.

Warning

If you have downstream replicas, use -Z instead of -z because they cannot read from a compressed journal.

-Z

Compress (in gzip format) checkpoint, but leave journal uncompressed for use by replica servers. That is, it applies to -jc, not -jd.

Note

Can be used when taking a checkpoint that rotates the journal: p4d -jc -Z

The -Z option is not used for recovery: p4d -jr

Journal restore options

Journal restore option	Meaning
`-jr file`	Restore metadata from a checkpoint and/or journal file. If the journal header in the checkpoint file contains a server ID and the checkpoint file was created by `p4d -P serverID -jd file`, a `server.id` file will be created containing that server ID. If you specify the `-r $P4ROOT` option on the command line, the `-r` option must precede the `-jr` option. Note When using a relative path to identify the file, the path is relative to the `P4ROOT` folder, not the location from which you ran the command.
`-jrp file`	Same as the row above, except with parallel threads. See Parallel checkpointing, dumping and recovery.
`-R service -jr file`	Similar to `-jr` for restoring metadata from a checkpoint and/or journal file, but only restore metadata appropriate for the service type that is specified by the `-R service` option, such as `-R commit-server` or `-R edge-server` Tip The `-R edge-server` option is useful for the initial seeding of edge servers. If the journal header in the checkpoint file contains a server ID and the checkpoint file was created by `p4d -P serverID -jd file`, a `server.id` file will be created containing that server ID.
`-jrc file`	Journal-restore with integrity-checking. Because this option locks the database, this option is intended only for use by replica servers started with the `p4 replicate` command.
`-jrF file`	Allow replaying a checkpoint over an existing database. (Bypass the check done by the `-jr` option to see if a checkpoint is being replayed into an existing database directory by mistake.)
`-b batch -jr file`	Read `batch` lines of journal records, sorting and removing duplicates before updating the database. The default is `5000`, but can be set to `1` to force serial processing. This combination of options is intended for use with replica servers started with the `p4 replicate` command.
`-f -jr file`	Ignore failures to delete records. This meaning of `-f` applies only when `-jr` is present. This combination of options is intended for use with replica servers started with the `p4 replicate` command. By default, journal restoration halts if record deletion fails. As with all journal-restore commands, if you specify the `-r $P4ROOT` option on the command line, the `-r` option must precede the `-jr` option.
`-m -jr file`	Schedule new revisions for replica network transfer. Required only in environments that use `p4 pull -u` for archived files, but `p4 replicate` for metadata. Not required in replicated environments based solely on `p4 pull`.
`-s -jr file`	Record restored journal records into regular journal, so that the records can be propagated from the server’s journal to any replicas downstream of the server. This combination of options is intended for use in conjunction with Perforce Support.
`-S -jr file`	Ignores all storage records in the replay file and instead recalculates the net storage reference count change from the revision records. Applies the recalculated reference count at the end of the replay or the end of each transaction. Like the `-s` option, the `-S` option cannot be combined with the `-m` option. Important This combination of options impacts the performance of journal replay. It is intended for small fixes under the guidance of Perforce Support.

Replication and multi-server options

Replication and multi-server option	Meaning
`-a host:port`	In multi-server environments, specify an authentication server for licensing and protections data. Overrides `P4AUTH` setting. Default is null.
`-g host:port`	In multi-server environments, specify a changelist server from which to obtain changelist numbers. Overrides `P4CHANGE` setting. Default is null.
`-t host:port`	For replicas, specify the target (master) server from which to pull data. Overrides `P4TARGET` setting. Default is null.
`-u serviceuser`	For replicas, authenticate as the specified `serviceuser` when communicating with the master. The service user must have a valid ticket before replica operations will succeed.

Journal dump and restore filtering

Journal dump/restore filtering	Meaning
`-jd file db.table`	Dump `db.table` by creating a checkpoint `file` that contains only the data stored in `db.table`. This command can also be used with non-journaled tables.
`-k db.table1,db.table2,... -jd file`	Dump a set of named tables to a single dump `file`.
`-K db.table1,db.table2,... -jd file`	Dump all tables except the named tables to the dump `file`.
`-P serverid -jd file`	Specify filter patterns for `p4d -jd` by specifying a `serverid` from which to read filters (see `p4 help server`, or use the older syntax described in `p4 help export`). Tip This option is useful for seeding a filtered replica.
`-R service -jd file`	Filter tables based on the `service` specified: `edge-server` excludes the tables that are specific to edge servers Tip This option is useful for the initial seeding of edge servers. `commit-server` includes all tables
`-k db.table1,db.table2,... -jr file`	Restore from `file`, including only journal records for the tables named in the list specified by the `-k` option.
`-K db.table1,db.table2,... -jr file`	Restore from `file`, excluding all journal records for the tables named in the list specified by the `-K` option.

Certificate handling

Certificate Handling Meaning

Certificate Handling	Meaning
`-Gc`	Generate SSL credentials files for the server: create a private key and certificate file in `P4SSLDIR`, and then exit. Requires that `P4SSLDIR` be set to a directory that is owned by the user invoking the command, and that is readable only by that user. If `config.txt` is present in `P4SSLDIR`, generate a self-signed certificate with specified characteristics.
`-Gf`	Display the fingerprint of the server’s public key, and exit. Administrators can communicate this fingerprint to end users, who can then use the `p4 trust` command to determine whether or not the fingerprint (of the server to which they happen to be connecting) is accurate.

-Gc

Generate SSL credentials files for the server: create a private key and certificate file in P4SSLDIR, and then exit.

Requires that P4SSLDIR be set to a directory that is owned by the user invoking the command, and that is readable only by that user. If config.txt is present in P4SSLDIR, generate a self-signed certificate with specified characteristics.

-Gf

Display the fingerprint of the server’s public key, and exit.

Administrators can communicate this fingerprint to end users, who can then use the p4 trust command to determine whether or not the fingerprint (of the server to which they happen to be connecting) is accurate.

Configuration options

Configuration option Meaning

Configuration option	Meaning
`-cshow`	Display the contents of `db.config` without starting the service. (That is, run `p4 configure show allservers`, but without a running service.)
`-cset server#var=val`	Set a Helix Server configurable without starting the service, optionally specifying the server for which the configurable is to apply. For example, p4d -r . "-cset replica#track=1" p4d -r . "-cset replica#track=1 replica#server=3" It is best to include the entire `variable=value` expression in quotation marks.
`-cunset server#var`	Unset the specified configurable.

-cshow

Display the contents of db.config without starting the service. (That is, run p4 configure show allservers, but without a running service.)

-cset server#var=val

Set a Helix Server configurable without starting the service, optionally specifying the server for which the configurable is to apply. For example,

p4d -r . "-cset replica#track=1"

p4d -r .  "-cset replica#track=1 replica#server=3"

It is best to include the entire variable=value expression in quotation marks.

-cunset server#var

Unset the specified configurable.

Failback options

In regard to Failback after failover, we recommend that you first preview the commands and only include -y if the preview looks acceptable.

Command	Purpose
`p4d -r p4root -Fm masterServerID standbyServerID`	To preview the conversion of the original master server to a standby for the current master.
`p4d -r p4root -y -Fm masterServerID standbyServerID`	To perform the conversion of the original master server to a standby for the current master. The converted standby will then be ready for a later p4 failback command.
`p4d -r p4root -Fs masterServerID standbyServerID`	(Optional) To preview the conversion of the original standby server to a standby for the restored master.
`p4d -r p4root -y -Fs masterServerID standbyServerID`	(Optional) To perform the conversion of the original standby server to a standby for the restored master.

Usage Notes

Do not run p4d as root. See Running the Helix Server (p4d) as an unprivileged user.
On all systems, journaling is enabled by default. If P4JOURNAL is unset when p4d starts, the default location for the journal is $P4ROOT. If you want to manually disable journaling, you must explicitly set P4JOURNAL to off.
Take checkpoints and truncate the journal often, preferably as part of your nightly backup process.
Checkpointing and journaling preserve only your Helix Server metadata (data about your stored files). The stored files themselves (the files containing your source code) reside under P4ROOT and must be also be backed up as part of your regular backup procedure.
It is best to keep journal files and checkpoints on a different hard drive or network location than the Helix Server database.
If your users use triggers, don’t use the -f (non-forking mode) option. To run trigger scripts, the Perforce service needs to be able to "fork" (spawn copies of itself).
After a hardware failure, the options required for restoring your metadata from your checkpoint and journal files can vary, depending on whether data was corrupted.
Because restorations from backups involving loss of files under P4ROOT often require the journal file, we strongly recommend that the journal file reside on a separate filesystem from P4ROOT. This way, in the event of corruption of the filesystem containing P4ROOT, the journal is likely to remain accessible.
The database upgrade option (-xu) can require considerable disk space. For details, see the Release Notes.

Typical tasks

To start the service, listening to port `1999`, with journaling enabled and written to `journalfile`.	`p4d -d -p 1999 -J /opt/p4d/journalfile`
To checkpoint a server with a non-default journal file, the `-J` option (or the environment variable `P4JOURNAL`) must match the journal file specified when the server was started.	Checkpoint with: `p4d -J /p4d/jfile -jc` or `P4JOURNAL=/p4d/jfile ; export P4JOURNAL; p4d -jc`
To compress checkpoints and journals, which creates two files: myCheckpoint.gz and myCheckpoint.md5.	p4d -jd -z myCheckpoint
To create a compressed checkpoint from a server with files in directory `P4ROOT`.	`p4d -r $P4ROOT -z -jc`
To create a compressed checkpoint with a user-specified prefix of “myCheckpoint” from a server with files in directory `P4ROOT`.	`p4d -r $P4ROOT -z -jc myCheckpoint`
To restore metadata from a checkpoint named `checkpoint.3` for a server with root directory `P4ROOT`.	`p4d -r $P4ROOT -jr checkpoint.3`
To restore metadata from a compressed checkpoint named `checkpoint.3.gz` for a server with root directory `P4ROOT`.	`p4d -r $P4ROOT -z -jr checkpoint.3.gz`