INTRO(8) System Manager's Manual INTRO(8)


introintroduction to system maintenance and operation commands


The manual pages in section 8 contain information related to system operation and maintenance. They describe commands concerning file systems, such as edquota(8), fsck(8), mount(8), and newfs(8). They also cover commands concerning system backup/recovery, such as dump(8) and restore(8).
There are pages which document the running of the system, such as afterboot(8), ifconfig(8), security(8), and the configuration files located in /etc. Procedures concerning system failure are documented in crash(8).
Section 8 pages also describe network services and daemons. The rest of this page discusses some of the main daemons available on the OpenBSD system, and how to enable/disable them.
System daemons are controlled by the script rc(8), which is in turn configured by rc.conf(8). For example the HTTP daemon httpd(8) is controlled by the following line from rc.conf(8):
Thus it is not started by default. To enable or disable daemon processes, administrators should edit the file rc.conf.local(8) or use the rcctl(8) utility. The rc.conf.local(8) file overrides variable assignments in rc.conf(8). So to enable httpd(8), the following line might be added to /etc/rc.conf.local:
As can be seen above, this method is also used to specify additional options.
Below is a list of some of the daemons available. For further information, see rc(8) and the individual pages for the utilities.

Automounter daemon (amd)

If using the amd(8) daemon, go into the /etc/amd directory and set it up by renaming master.sample to master and editing it and creating other maps as needed. Alternatively, you can get your maps with YP.
Relevant rc.conf(8) variables: amd_flags and amd_master.

DNS server

If you are using a name server, check the /etc/resolv.conf file. It may look something like:
lookup file bind
If using a caching name server, add the line "nameserver" first.
Relevant rc.conf(8) variables: nsd_flags and unbound_flags.

Clock synchronisation

In order to make sure the system clock is correct, it may be synchronised with a number of external sources. The utilities available are: ntpd(8) and rdate(8).
Relevant rc.conf(8) variables: ntpd_flags.


If this is a BOOTP or DHCP server, edit /etc/dhcpd.conf as needed. See also diskless(8).
Relevant rc.conf(8) variables: bootparamd_flags, dhcpd_flags, and dhcrelay_flags.

HP remote boot server

Edit /etc/rbootd.conf if needed for remote booting. If you do not have HP computers doing remote booting, do not enable this. See also diskless(8).
Relevant rc.conf(8) variables: rbootd_flags.

httpd web server (HTTP)

On OpenBSD it will chroot(2) to /var/www. Detailed information is available in httpd(8) and httpd.conf(5).
Relevant rc.conf(8) variables: httpd_flags.

NFS server

If this is an NFS server, edit /etc/exports.
Relevant rc.conf(8) variables: mountd_flags and nfsd_flags.

Relay Daemon

A relay daemon, relayd(8), able to run as a load-balancer, application layer gateway, or transparent proxy.
Relevant rc.conf(8) variables: relayd_flags.

Routing Daemons

Various daemons for managing routing tables are available: bgpd(8), eigrpd(8), ospfd(8), and ripd(8).
Relevant rc.conf(8) variables: bgpd_flags, eigrpd_flags, ospfd_flags, and ripd_flags.

RPC-based network services

Several services depend on the RPC portmapper, portmap(8), being running for proper operation. This includes YP and NFS exports, among other services.
Relevant rc.conf(8) variables: portmap_flags.

YP setup

Check the YP domain name with the domainname(1) command. If necessary, correct it by editing the /etc/defaultdomain file (see defaultdomain(5)). The /etc/netstart script reads this file on boot to determine and set the domain name. You may also set the running system's domain name with the domainname(1) command.
Relevant rc.conf(8) variables: ypbind_flags.
After starting YP client services, perform the remaining YP activation as described in passwd(5) and group(5).
In particular, to enable YP passwd support, you'll need to add the following line to /etc/master.passwd:
You do this by using vipw(8).
There are many more YP man pages available to help you. You can find more information by starting with yp(8).


afterboot(8), rc(8), rc.conf(8), rcctl(8)


The intro section manual page appeared in 4.2BSD.
November 4, 2015 OpenBSD 6.1