# SYSTEMD-PSTORE.SERVICE(8) - man - phpMan

[SYSTEMD-PSTORE.SERVICE(8)](https://www.chedong.com/phpMan.php/man/SYSTEMD-PSTORE.SERVICE/8/markdown)              systemd-pstore.service              [SYSTEMD-PSTORE.SERVICE(8)](https://www.chedong.com/phpMan.php/man/SYSTEMD-PSTORE.SERVICE/8/markdown)



## NAME
       systemd-pstore.service, systemd-pstore - A service to archive contents of pstore

## SYNOPSIS
       /lib/systemd/systemd-pstore

       systemd-pstore.service

## DESCRIPTION
       systemd-pstore.service is a system service that archives the contents of the Linux persistent
       storage filesystem, pstore, to other storage, thus preserving the existing information
       contained in the pstore, and clearing pstore storage for future error events.

       Linux provides a persistent storage file system, pstore, that can store error records when
       the kernel dies (or reboots or powers-off). These records in turn can be referenced to debug
       kernel problems (currently the kernel stores the tail of the kernel log, which also contains
       a stack backtrace, into pstore).

       The pstore file system supports a variety of backends that map onto persistent storage, such
       as the ACPI ERST and UEFI variables. The pstore backends typically offer a relatively small
       amount of persistent storage, e.g. 64KiB, which can quickly fill up and thus prevent
       subsequent kernel crashes from recording errors. Thus there is a need to monitor and extract
       the pstore contents so that future kernel problems can also record information in the pstore.

       The pstore service is independent of the kdump service. In cloud environments specifically,
       host and guest filesystems are on remote filesystems (e.g. iSCSI or NFS), thus kdump relies
       (implicitly and/or explicitly) upon proper operation of networking software *and* hardware
       *and* infrastructure. Thus it may not be possible to capture a kernel coredump to a file
       since writes over the network may not be possible.

       The pstore backend, on the other hand, is completely local and provides a path to store error
       records which will survive a reboot and aid in post-mortem debugging.

       The **systemd-pstore** executable does the actual work. Upon starting, the pstore.conf file is
       read and the /sys/fs/pstore/ directory contents are processed according to the options.
       Pstore files are written to the journal, and optionally saved into /var/lib/systemd/pstore/.

## CONFIGURATION
       The behavior of **systemd-pstore** is configured through the configuration file
       /etc/systemd/pstore.conf and corresponding snippets /etc/systemd/pstore.conf.d/*.conf, see
       [**pstore.conf**(5)](https://www.chedong.com/phpMan.php/man/pstore.conf/5/markdown).

### Disabling pstore processing
       To disable pstore processing by **systemd-pstore**, set

           Storage=none

       in [**pstore.conf**(5)](https://www.chedong.com/phpMan.php/man/pstore.conf/5/markdown).

### Kernel parameters
       The kernel has two parameters, /sys/module/kernel/parameters/crash_kexec_post_notifiers and
       /sys/module/printk/parameters/always_kmsg_dump, that control writes into pstore. The first
       enables storing of the kernel log (including stack trace) into pstore upon a panic or crash,
       and the second enables storing of the kernel log upon a normal shutdown (shutdown, reboot,
       halt). These parameters can be managed via the [**tmpfiles.d**(5)](https://www.chedong.com/phpMan.php/man/tmpfiles.d/5/markdown) mechanism, specifically the file
       /usr/lib/tmpfiles/systemd-pstore.conf.

## USAGE
       Data stored in the journal can be viewed with [**journalctl**(1)](https://www.chedong.com/phpMan.php/man/journalctl/1/markdown) as usual.

## SEE ALSO
       [**pstore.conf**(5)](https://www.chedong.com/phpMan.php/man/pstore.conf/5/markdown)



systemd 249                                                                [SYSTEMD-PSTORE.SERVICE(8)](https://www.chedong.com/phpMan.php/man/SYSTEMD-PSTORE.SERVICE/8/markdown)