## 6.10 Configuration Files ### 6.10.1 /etc Layout There are a number of directories in which configuration information is kept. These include: [[!table data=""" | `/etc` | Generic system configuration information; data here is system-specific. `/etc/defaults` | Default versions of system configuration files. `/etc/mail` | Extra [sendmail(8)](http://leaf.dragonflybsd.org/cgi/web-man?command=sendmail§ion=8) configuration, other MTA configuration files. `/etc/ppp` | Configuration for both user- and kernel-ppp programs. `/etc/namedb` | Default location for [named(8)](http://leaf.dragonflybsd.org/cgi/web-man?command=named§ion=8) data. Normally `named.conf` and zone files are stored here. `/usr/local/etc` | Configuration files for installed applications. May contain per-application subdirectories. `/usr/local/etc/rc.d` | Start/stop scripts for installed applications. `/var/db` | Automatically generated system-specific database files, such as the package database, the locate database, and so on | """]] ### 6.10.2 Hostnames #### 6.10.2.1 /etc/resolv.conf `/etc/resolv.conf` dictates how DragonFly's resolver accesses the Internet Domain Name System (DNS). The most common entries to `resolv.conf` are: [[!table data=""" | `nameserver` | The IP address of a name server the resolver should query. The servers are queried in the order listed with a maximum of three. `search` | Search list for hostname lookup. This is normally determined by the domain of the local hostname. `domain` | The local domain name. | """]] A typical `resolv.conf`: search example.com nameserver 147.11.1.11 nameserver 147.11.100.30 **Note:** Only one of the `search` and `domain` options should be used. If you are using DHCP, [dhclient(8)](http://leaf.dragonflybsd.org/cgi/web-man?command=dhclient§ion=8) usually rewrites `resolv.conf` with information received from the DHCP server. #### 6.10.2.2 /etc/hosts `/etc/hosts` is a simple text database reminiscent of the old Internet. It works in conjunction with DNS and NIS providing name to IP address mappings. Local computers connected via a LAN can be placed in here for simplistic naming purposes instead of setting up a [named(8)](http://leaf.dragonflybsd.org/cgi/web-man?command=named§ion=8) server. Additionally, `/etc/hosts` can be used to provide a local record of Internet names, reducing the need to query externally for commonly accessed names. # # # Host Database # This file should contain the addresses and aliases # for local hosts that share this file. # In the presence of the domain name service or NIS, this file may # not be consulted at all; see /etc/nsswitch.conf for the resolution order. # # ::1 localhost localhost.my.domain myname.my.domain 127.0.0.1 localhost localhost.my.domain myname.my.domain # # Imaginary network. #10.0.0.2 myname.my.domain myname #10.0.0.3 myfriend.my.domain myfriend # # According to RFC 1918, you can use the following IP networks for # private nets which will never be connected to the Internet: # # 10.0.0.0 - 10.255.255.255 # 172.16.0.0 - 172.31.255.255 # 192.168.0.0 - 192.168.255.255 # # In case you want to be able to connect to the Internet, you need # real official assigned numbers. PLEASE PLEASE PLEASE do not try # to invent your own network numbers but instead get one from your # network provider (if any) or from the Internet Registry (ftp to # rs.internic.net, directory `/templates'). # `/etc/hosts` takes on the simple format of: [Internet address] [official hostname] [alias1] [alias2] ... For example: 10.0.0.1 myRealHostname.example.com myRealHostname foobar1 foobar2 Consult [hosts(5)](http://leaf.dragonflybsd.org/cgi/web-man?command=hosts§ion=5) for more information. ### 6.10.3 Log File Configuration #### 6.10.3.1 syslog.conf `syslog.conf` is the configuration file for the [syslogd(8)](http://leaf.dragonflybsd.org/cgi/web-man?command=syslogd§ion=8) program. It indicates which types of `syslog` messages are logged to particular log files. # # # Spaces ARE valid field separators in this file. However, # other *nix-like systems still insist on using tabs as field # separators. If you are sharing this file between systems, you # may want to use only tabs as field separators here. # Consult the syslog.conf(5) manual page. *.err;kern.debug;auth.notice;mail.crit /dev/console *.notice;kern.debug;lpr.info;mail.crit;news.err /var/log/messages security.* /var/log/security mail.info /var/log/maillog lpr.info /var/log/lpd-errs cron.* /var/log/cron *.err root *.notice;news.err root *.alert root *.emerg * # uncomment this to log all writes to /dev/console to /var/log/console.log #console.info /var/log/console.log # uncomment this to enable logging of all log messages to /var/log/all.log #*.* /var/log/all.log # uncomment this to enable logging to a remote log host named loghost #*.* @loghost # uncomment these if you're running inn # news.crit /var/log/news/news.crit # news.err /var/log/news/news.err # news.notice /var/log/news/news.notice !startslip *.* /var/log/slip.log !ppp *.* /var/log/ppp.log Consult the [syslog.conf(5)](http://leaf.dragonflybsd.org/cgi/web-man?command=syslog.conf§ion=5) manual page for more information. #### 6.10.3.2 newsyslog.conf `newsyslog.conf` is the configuration file for [newsyslog(8)](http://leaf.dragonflybsd.org/cgi/web-man?command=newsyslog§ion=8), a program that is normally scheduled to run by [cron(8)](http://leaf.dragonflybsd.org/cgi/web-man?command=cron§ion=8). [newsyslog(8)](http://leaf.dragonflybsd.org/cgi/web-man?command=newsyslog§ion=8) determines when log files require archiving or rearranging. `logfile` is moved to `logfile.0`, `logfile.0` is moved to `logfile.1`, and so on. Alternatively, the log files may be archived in [gzip(1)](http://leaf.dragonflybsd.org/cgi/web-man?command=gzip§ion=1) format causing them to be named: `logfile.0.gz`, `logfile.1.gz`, and so on. `newsyslog.conf` indicates which log files are to be managed, how many are to be kept, and when they are to be touched. Log files can be rearranged and/or archived when they have either reached a certain size, or at a certain periodic time/date. # configuration file for newsyslog # # # filename [owner:group] mode count size when [ZB] [/pid_file] [sig_num] /var/log/cron 600 3 100 * Z /var/log/amd.log 644 7 100 * Z /var/log/kerberos.log 644 7 100 * Z /var/log/lpd-errs 644 7 100 * Z /var/log/maillog 644 7 * @T00 Z /var/log/sendmail.st 644 10 * 168 B /var/log/messages 644 5 100 * Z /var/log/all.log 600 7 * @T00 Z /var/log/slip.log 600 3 100 * Z /var/log/ppp.log 600 3 100 * Z /var/log/security 600 10 100 * Z /var/log/wtmp 644 3 * @01T05 B /var/log/daily.log 640 7 * @T00 Z /var/log/weekly.log 640 5 1 $W6D0 Z /var/log/monthly.log 640 12 * $M1D0 Z /var/log/console.log 640 5 100 * Z Consult the [newsyslog(8)](http://leaf.dragonflybsd.org/cgi/web-man?command=newsyslog§ion=8) manual page for more information. ### 6.10.4 sysctl.conf `sysctl.conf` looks much like `rc.conf`. Values are set in a `variable=value` form. The specified values are set after the system goes into multi-user mode. Not all variables are settable in this mode. A sample `sysctl.conf` turning off logging of fatal signal exits and letting Linux programs know they are really running under DragonFly: kern.logsigexit=0 # Do not log fatal signal exits (e.g. sig 11) compat.linux.osname=DragonFly compat.linux.osrelease=4.3-STABLE