MirOS Manual: afterboot(8), faq(8)

AFTERBOOT(8)             BSD System Manager's Manual              AFTERBOOT(8)

NAME

     afterboot - things to check after the first complete boot

DESCRIPTION

Starting out

     This document attempts to list items for the system administrator to
     check and set up after the installation and first complete boot of the
     system. The idea is to create a list of items that can be checked off so
     that you have a warm fuzzy feeling that something obvious has not been
     missed. A basic knowledge of UNIX is assumed, otherwise type

           # help

     Complete instructions for correcting and fixing items is not provided.
     There are manual pages and other methodologies available for doing that.
     For example, to view the man page for the ls(1) command, type:

           # man 1 ls

     Administrators will rapidly become more familiar with MirOS BSD if they
     get used to using the high quality manual pages.

     In order to browse a file, for example /usr/share/doc/legal/1stREAD,
     which you should really read, type:

           # less /usr/share/doc/legal/1stREAD

     Within less(1), type ? for help and q to quit.

     Other important files to read include /usr/share/doc/legal/LICENCE, which
     refers to most other files within the same directory. You are obliged to
     read, understand and acknowledge the licences outlined in these files to
     use this product.

Errata

     By the time that you have installed your system, it is quite likely that
     bugs in the release have been found. Most significant and easily fixed
     problems will be reported at the errata webpage at http://mirbsd.de/ or
     its subpages. The web page will mention if a problem is security related.
     It is recommended that you check this page regularly.

Online help

     Basic use of the lynx(1) command required.

     To see current online manual pages, go to this page:
     http://www.mirbsd.org/cman/

     For interactive help, see our mailing lists: http://www.mirbsd.org/?mail

     There are several IRC channels to connect to: http://www.mirbsd.org/?irc
     Please note there is no longer an IRC client in the default installation;
     use net/sirc, net/bitchx, or net/irssi.

Login

     During installation, a user with which you can login has been created.
     Use sudo(8) to perform administrative tasks. Logging in as "root" is no
     longer possible; this also affects single user mode (which only works
     after you manually set a root password). You can do so on the console, or
     over the network using ssh(1). If you wish to log in as root over the
     network, edit the /etc/ssh/sshd_config file and set PermitRootLogin to
     "yes" first (see sshd_config(5)), but this is totally insecure. Also,
     root no longer has a home directory, so using it for anything practical
     is not intended.

     If you want to use RSA Version 1 or DSA Version 2 keys with sshd(8), you
     must edit the /etc/ssh/sshd_config file first and generate the keys using
           # /usr/bin/ssh-keygen -q -t rsa1 -f /etc/ssh/ssh_host_key -N ''
     for RSA Version 1 (old), and
           # /usr/bin/ssh-keygen -q -t dsa -f /etc/ssh/ssh_host_dsa_key -N ''
     for DSA Version 2 (extremely slow). These are however both totally in-
     secure.

     Upon successful login on the console, you may see the message "Don't
     login as root, use su". For security reasons, it is bad practice to log
     in as root during regular use and maintenance of the system. Instead, ad-
     ministrators are encouraged to add a "regular" user, add said user to the
     "wheel" group, then use the su(1) and sudo(8) commands when root
     privileges are required. This process is described in more detail later.

Root password

     This section only applies when you want to log in as root (which you
     should not do), or for single-user mode if you remove the word secure
     from the line for the console in /etc/ttys. Change the password for the
     root user. (Note that throughout the documentation, the term "superuser"
     is a synonym for the root user.) Choose a password that has numbers, di-
     gits, and special characters (not space) as well as from the upper and
     lower case alphabet. Do not choose any word in any language. It is common
     for an intruder to use dictionary attacks. Type the command
     /usr/bin/passwd to change it.

     It is a good idea to always specify the full path name for both the
     passwd(1) and su(1) commands as this inhibits the possibility of files
     placed in your execution PATH for most shells. Furthermore, the
     superuser's PATH should never contain the current directory (".").

Secure console

     If you set a root password, it's a good idea to remove the word secure
     from the line starting with console in the /etc/ttys file. Leaving the
     word secure there permits single-user boot and login without a password,
     but if you remove it, you had better set a root password first (see
     above) because otherwise you will not be able to use single user mode at
     all, even if you need it to rescue the system.

System date

     Check the system date with the date(1) command. If needed, change the
     date, and/or change the symbolic link of /etc/localtime to the correct
     time zone in the /usr/share/zoneinfo directory.

     It is highly recommended to use ntpd(8), or at least rdate(8), to set the
     system clock against a NTP or time server. In the default crontab, there
     is even an entry which does that automatically after installation, using
     the adjtime(2) system call, which is not suitable for setting the clock,
     only adjusting it by a few milliseconds, but can be used in a runlevel
     greater than 0 as well.

     Examples:

     Set the current date to January 27th, 1999 3:04pm:
           # date 199901271504

     Set the time zone to Atlantic Standard Time:
           # ln -fs /usr/share/zoneinfo/Canada/Atlantic /etc/localtime

Check hostname

     Use the hostname command to verify that the name of your machine is
     correct. See the man page for hostname(1) if it needs to be changed. You
     will also need to edit the /etc/myname file to have it stick around for
     the next reboot.

Verify network interface configuration

     The first thing to do is an ifconfig -a to see if the network interfaces
     are properly configured. Correct by editing /etc/hostname.interface
     (where interface is the interface name, e.g., "le0") and then using
     ifconfig(8) to manually configure it if you do not wish to reboot. Read
     the hostname.if(5) man page for more information on the format of
     /etc/hostname.interface files. The default routes are also set in these
     files; if you come from OpenBSD you will have to merge your /etc/mygate
     into a /etc/hostname.interface file - preferably with interface being the
     one on which the route is set. The loopback interface will look something
     like:

           lo0: flags=8009<UP,LOOPBACK,MULTICAST> mtu 32972
                   inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
                   inet6 ::1 prefixlen 128
                   inet 127.0.0.1 netmask 0xff000000

     an Ethernet interface something like:

           le0: flags=9863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST>
                   inet 192.168.4.52 netmask 0xffffff00 broadcast 192.168.4.255
                   inet6 fe80::5ef0:f0f0%le0 prefixlen 64 scopeid 0x1

     and a PPP interface something like:

           ppp0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST>
                   inet 203.3.131.108 --> 198.181.0.253 netmask 0xffff0000

     See netstart(8) for instructions on configuring multicast routing.

     See dhcp(8) for instructions on configuring interfaces with DHCP.

Check routing tables

     Issue a netstat -rn command. The output will look something like:

           Routing tables

           Internet:
           Destination    Gateway           Flags  Refs     Use  Mtu  Interface
           default        192.168.4.254     UGS      0 11098028    -  le0
           127            127.0.0.1         UGRS     0        0    -  lo0
           127.0.0.1      127.0.0.1         UH       3       24    -  lo0
           192.168.4      link#1            UC       0        0    -  le0
           192.168.4.52   8:0:20:73:b8:4a   UHL      1     6707    -  le0
           192.168.4.254  0:60:3e:99:67:ea  UHL      1        0    -  le0

           Internet6:
           Destination        Gateway       Flags  Refs  Use     Mtu  Interface
           ::/96              ::1           UGRS     0     0   32972  lo0 =>
           ::1                ::1           UH       4     0   32972  lo0
           ::ffff:0.0.0.0/96  ::1           UGRS     0     0   32972  lo0
           fc80::/10          ::1           UGRS     0     0   32972  lo0
           fe80::/10          ::1           UGRS     0     0   32972  lo0
           fe80::%le0/64      link#1        UC       0     0    1500  le0
           fe80::%lo0/64      fe80::1%lo0   U        0     0   32972  lo0
           ff01::/32          ::1           U        0     0   32972  lo0
           ff02::%le0/32      link#1        UC       0     0    1500  le0
           ff02::%lo0/32      fe80::1%lo0   UC       0     0   32972  lo0

     The default gateway address is stored in the hostname.if(5) file. If you
     need to edit this file, a painless way to reconfigure the network after-
     wards is route flush followed by a sh -x /etc/netstart command. You may
     manually configure using a series of route add and route delete commands
     (see route(8)). If you run dhclient(8) you will have to kill it by run-
     ning kill $(</var/run/dhclient.pid) after you flush the routes.

     If you wish to route packets between interfaces, add one or both of the
     following directives (depending on whether IPv4 or IPv6 routing is re-
     quired) to /etc/sysctl.conf:

           net.inet.ip.forwarding=1
           net.inet6.ip6.forwarding=1

     Packets are not forwarded by default, due to RFC requirements.

Check disk mounts

     Check that the disks are mounted correctly by comparing the /etc/fstab
     file against the output of the mount(8) and df(1) commands. Example:

           # cat /etc/fstab
           /dev/sd0a / ffs rw 1 1
           /dev/sd0d /usr ffs rw,nodev 1 2
           /dev/sd0e /var ffs rw,nodev,nosuid 1 3
           /dev/sd0g /tmp ffs rw,nodev,nosuid 1 4
           /dev/sd0h /home ffs rw,nodev,nosuid 1 5

           # mount
           /dev/sd0a on / type ffs (local)
           /dev/sd0d on /usr type ffs (local, nodev)
           /dev/sd0e on /var type ffs (local, nodev, nosuid)
           /dev/sd0g on /tmp type ffs (local, nodev, nosuid)
           /dev/sd0h on /home type ffs (local, nodev, nosuid)

           # df
           Filesystem  1024-blocks     Used    Avail Capacity  Mounted on
           /dev/sd0a         22311    14589     6606    69%    /
           /dev/sd0d        203399   150221    43008    78%    /usr
           /dev/sd0e         10447      682     9242     7%    /var
           /dev/sd0g         18823        2    17879     0%    /tmp
           /dev/sd0h          7519     5255     1888    74%    /home

           # pstat -s
           Device      512-blocks     Used    Avail Capacity  Priority
           swap_device     131072    84656    46416    65%    0

     Edit /etc/fstab and use the mount(8) and umount(8) commands as appropri-
     ate. Refer to the above example and fstab(5) for information on the for-
     mat of this file.

     You may wish to do NFS partitions now too, or you can do them later.

Check the running system

     You can use ps(1), netstat(1), and fstat(1) to check on running
     processes, network connections, and opened files, respectively.

CHANGING /etc FILES
     The system should be usable now, but you may wish to do more customizing,
     such as adding users, etc. Many of the following sections may be skipped
     if you are not using that package (for example, skip the Sendmail section
     if you won't be using Sendmail (not recommended)). We suggest that you cd
     /etc and edit most of the files in that directory.

     Note that the /etc/motd file is modified by /etc/rc whenever the system
     is booted. To keep any custom message intact, ensure that you leave two
     blank lines at the top, or your message will be overwritten.

Add new users

     Add users. There is no adduser(8) script. You may use vipw(8) to add
     users to the /etc/passwd file and edit /etc/group by hand to add new
     groups. You may also wish to edit /etc/login.conf and tune some of the
     limits documented in login.conf(5). The manual page for su(1) tells you
     to make sure to put people in the 'wheel' group if they need root access.
     For example:

           wheel:*:0:root,myself

System command scripts

     The /etc/rc.* scripts are invoked at boot time, after single user mode
     has exited, and at shutdown. The whole process is controlled, more or
     less, by the master script /etc/rc. This script should not be changed by
     administrators.

     /etc/rc is in turn influenced by the configuration variables present in
     /etc/rc.conf. Again this script should not be changed by administrators:
     site-specific changes should be made to (freshly created if necessary)
     /etc/rc.conf.local.

     Any commands which should be run before the system sets its secure level
     should be made to /etc/rc.securelevel, and commands to be run after the
     system sets its secure level should be made to /etc/rc.local. Commands to
     be run before system shutdown should be set in /etc/rc.shutdown.

     For more information about system startup/shutdown files, see rc(8),
     rc.conf(8), securelevel(7), and rc.shutdown(8).

     If you've installed X, you may want to turn on xdm(1), the X Display
     Manager. To do this, change the value of xdm_flags in /etc/rc.conf.local.

Set keyboard type

     Some architectures permit keyboard type control. Use the kbd(8) command
     to change the keyboard encoding. kbd -l will list all available encod-
     ings. kbd xxx will select the xxx encoding. Store the encoding in
     /etc/kbdtype to make sure it is set automatically at boot time.

Printers

     Edit /etc/printcap and /etc/hosts.lpd to get any printers set up. Consult
     lpd(8) and printcap(5) if needed.

Mail aliases

     Edit /etc/mail/aliases and set the three standard aliases to go to either
     a mailing list, or the system administrator.

           # Well-known aliases -- these should be filled in!
           root:           sysadm
           manager:        root
           dumper:         root

     Run newaliases(8) after changes.

Sendmail

     MirOS ships with a default /etc/mail/localhost.cf file that will work for
     simple installations; it was generated from openbsd-localhost.mc in
     /usr/share/sendmail/cf. Please see /usr/share/sendmail/README and
     /usr/share/doc/smm/08.sendmailop/op.me for information on generating your
     own sendmail configuration files. For the default installation, sendmail
     is configured to only accept connections from the local host and to not
     accept connections on any external interfaces. This makes it possible to
     send mail locally, but not receive mail from remote servers, which is
     ideal if you have one central incoming mail machine and several clients.
     To cause sendmail to accept external network connections, modify the
     sendmail_flags variable in /etc/rc.conf.local to use the
     /etc/mail/sendmail.cf file in accordance with the comments therein. This
     file was generated from openbsd-proto.mc.

     Note that sendmail now also listens on port 587 by default. This is to
     implement the RFC 2476 message submission protocol. You may disable this
     via the no_default_msa option in your sendmail .mc file. See
     /usr/share/sendmail/README for more information. The
     /etc/mail/localhost.cf file already has this disabled.

Name server (DNS)

     If you are using a name server from MirPorts (djbdns or BIND 9), check
     the /etc/resolv.conf file. It may look something like:

           domain nts.umn.edu
           nameserver 128.101.101.101
           nameserver 134.84.84.84
           search nts.umn.edu. umn.edu.
           lookup file bind

     If using a caching name server, add the line "nameserver 127.0.0.1"
     first. To get a local BIND instance to run, you will need to set
     named_flags in /etc/rc.conf.local. In this case, make sure that named(8)
     is running (otherwise there are long waits for resolver timeouts).

BOOTP server

     If this is a BOOTP server, edit /etc/dhcpd.conf as needed. dhcpd(8) will
     have to be turned on in rc.conf.local(8).

Clock synchronisation

     In order to make sure the system clock is synchronised to that of a pub-
     licly accessible NTP server, make sure that /etc/rc.conf.local contains
     the following:

           ntpd_flags=""

     See ntpd(8), rdate(8), and timed(8) for more information on setting the
     system's date.

Concatenated disks (ccd)

     If you are using ccd(4) concatenated disks, edit /etc/ccd.conf. Use the
     ccdconfig -U command to unload and the ccdconfig -C command to create
     tables internal to the kernel for the concatenated disks. You then
     mount(8), umount(8), and edit /etc/fstab as needed.

DHCP server

     If this is a DHCP server, edit /etc/dhcpd.conf and /etc/dhcpd.interfaces
     as needed. You will have to make sure /etc/rc.conf.local has:

           dhcpd_flags=""

     or run dhcpd(8) manually.

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.

Kerberos

     If you are going to use kerberos(8) for authentication, and you already
     have a Kerberos master, change directory to /etc/kerberosV and configure.
     Remember to get a srvtab from the master so that the remote commands
     work.

NFS server

     If this is an NFS server make sure /etc/rc.conf.local has:

           nfs_server=YES

     Edit /etc/exports and get it correct. It is probably easier to reboot
     than to get the daemons running manually, but you can get the order
     correct by looking at /etc/rc.

RPC-based network services

     Several services depend on the RPC portmapper, portmap(8), being running
     for proper operation. This includes NFS exports, among other services. To
     get the RPC portmapper to start automatically on boot, you will need to
     have this line in /etc/rc.conf.local:

           portmap=YES

Daily, weekly, monthly scripts

     Look at and possibly edit the /etc/daily, /etc/weekly, and /etc/monthly
     scripts. Your site specific things should go into /etc/daily.local,
     /etc/weekly.local, and /etc/monthly.local.

     These scripts have been limited so as to keep the system running without
     filling up disk space from normal running processes and database updates.
     (You probably do not need to understand them.)

     The /altroot filesystem can optionally be used to provide a backup of the
     root filesystem on a daily basis. To take advantage of this, you must
     have an entry in /etc/fstab with "xx" for the mount option:

           /dev/wd0j /altroot ffs xx 0 0

     and you must add a line to root's crontab(5):

           ROOTBACKUP=1

     so that the /etc/daily script will make a daily backup of the root
     filesystem.

Tighten up security

     You might wish to tighten up security more by editing /etc/fbtab as when
     installing X. In /etc/inetd.conf comment out any extra entries you do not
     need, and only add things that are really needed.

Other files in /etc

     Look at the other files in /etc and edit them as needed. (Do not edit
     files ending in .db - like pwd.db, spwd.db, nor localtime, nor rmt, nor
     any directories.)

     Many files - for example, /etc/mk.conf, /etc/profile, /etc/rc.conf,
     /etc/changelist, and others - provide the ability to have them unchanged
     and place the changes into the file with .local added. Example:
           # echo 'rdate_flags="-n ntp0.nl.net"' >>/etc/rc.conf.local

     It is recommended to use rcs(1) for versioning files in /etc, especially
     those not in any changelist.

Crontab (background running processes)

     Check what is running by typing crontab -l as root and see if anything
     unexpected is present. Do you need anything else? Do you wish to change
     things? For example, if you do not like root getting standard output of
     the daily scripts, and want only the security scripts that are mailed
     internally, you can type crontab -e and change some of the lines to read:

           30  1  *  *  *   /bin/mksh /etc/daily >/var/log/daily.out 2>&1
           30  3  *  *  6   /bin/mksh /etc/weekly >/var/log/weekly.out 2>&1
           30  5  1  *  *   /bin/mksh /etc/monthly >/var/log/monthly.out 2>&1

     See crontab(5).

Next day cleanup

     After the first night's security run, change ownerships and permissions
     on files, directories, and devices; root should have received mail with
     subject: "<hostname> daily insecurity output.". This mail contains a set
     of security recommendations, presented as a list looking like this:

           var/mail:
                   permissions (0755, 0775)
           etc/daily:
                   user (0, 3)

     The best bet is to follow the advice in that list. The recommended set-
     ting is the first item in parentheses, while the current setting is the
     second one. This list is generated by mtree(8) using /etc/mtree/special.
     Use chmod(1), chgrp(1), and chown(8) as needed.

Packages

     Install your own packages. See ports(7) and packages(7) for more details.

     Copy vendor binaries and install them. You will need to install any
     shared libraries, etc. (Hint: man -k compat to find out how to install
     and use compatibility mode.)

     There is also other third-party software that is available in source form
     only, either because it has not been ported to MirOS yet, or because
     licensing restrictions make binary redistribution impossible. Sometimes
     checking the mailing lists for past problems that people have encountered
     will result in a fix posted.

COMPILING A KERNEL

     Note: The standard MirOS kernel configuration (GENERIC) is suitable for
     most purposes. Use of an alternative kernel configuration is not recom-
     mended.

     First, review the system message buffer using the dmesg(8) command to
     find out information on your system's devices as probed by the kernel at
     boot. In particular, note which devices were not configured. This infor-
     mation will prove useful when editing kernel configuration files.

     To compile a kernel inside a writable source tree, do the following:

           # cd /usr/src/sys/arch/somearch/conf
           # vi SOMEFILE  (to make any changes)
           # config SOMEFILE
           # cd ../compile/SOMEFILE
           # make

     where somearch is the architecture (e.g. i386), and SOMEFILE should be a
     name indicative of a particular configuration (often that of the host-
     name). You can also do a make depend so that you will have dependencies
     there the next time you do a compile.

     If you are building your kernel again, before you do a make you should do
     a make depend after making changes (including updates or patches) to your
     kernel source, or a make clean after making changes to your kernel op-
     tions.

     After either of these two methods, you can place the new kernel (called
     bsd) in / (i.e. /bsd) and the system will boot it next time. Most people
     save their backup kernels as /bsd.1, /bsd.2, etc.

     It is not always necessary to recompile the kernel if only configuration
     changes are required. With config(8), you can change the device confi-
     guration in the kernel file directly:

           # config -e -o bsd.new /bsd
           OpenBSD 2.7-beta (GENERIC.rz0) #0: Mon Oct  4 03:57:22 MEST 1999
               root@winona:/usr/src/sys/arch/pmax/compile/GENERIC.rz0
           Enter 'help' for information
           ukc>

     Additionally, you can permanently save the changes made with UKC during
     boot time in the kernel image.

SEE ALSO

     aliases(5), bootpd(8), bootptab(5), ccd(4), ccdconfig(8), chgrp(1),
     chmod(1), chown(8), config(8), crontab(1), crontab(5), date(1), df(1),
     dhclient(8), dhcp(8), dhcpd(8), dmesg(8), fstat(1), hostname(1), ls(1),
     make(1), man(1), netstat(1), passwd(1), pkg_add(1), ps(1), ssh(1), su(1),
     xdm(1), ccd(4), aliases(5), crontab(5), dhcpd.conf(5), exports(5),
     fbtab(5), fstab(5), ftpd(8), group(5), hostname(1), hostname(7),
     hostname.if(5), login.conf(5), passwd(5), ttys(5), printcap(5),
     resolv.conf(5), ssh_config(5), sysctl.conf(5), hier(7), hostname(7),
     packages(7), ports(7), ccdconfig(8), chown(8), config(8), dhclient(8),
     dhcp(8), dhcpd(8), dmesg(8), ftpd(8), ifconfig(8), inetd(8), kbd(8),
     lpd(8), ls(1), make(1), man(1), mount(8), mtree(8), netstart(8),
     netstat(1), newaliases(8), ntpd(8), portmap(8), ports(7), printcap(5),
     rbootd(8), rc(8), rdate(8), rmt(8), route(8), sendmail(8), sudo(8),
     sysctl(8), timed(8), umount(8), vipw(8), xdm(1)

HISTORY

     This document first appeared in OpenBSD 2.2.

BUGS

     This document is totally out of date.

MirOS BSD #10-current           March 30, 2014                               8

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