266 lines
8.2 KiB
Groff
266 lines
8.2 KiB
Groff
.\" Automatically generated by Pod::Man version 1.15
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.\" Sun Jan 27 15:29:23 2002
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.\" ======================================================================
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.\"
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.IX Title "DHCPSYNC.8 1"
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.TH DHCPSYNC.8 1 "1.10" "2002-01-27" " "
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.UC
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.SH "NAME"
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dhcpsync \- synchronize \s-1DHCP\s0 configuration file
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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[ KEY=keyfile ] [ SHARED=/path/to/conffile ] [ SLEEP=seconds ] \fBdhcpsync\fR <hostname of slave>
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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This script shows how to detect if the dhcpd configuration has changed,
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and sync a shared conf file to the slave, and restart both servers.
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.Ip "o" 4
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It is run on the master failover peer
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.Ip "o" 4
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It uses rsync over ssh with an enforced command on the slave.
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.Ip "o" 4
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It relies on all include files being mentioned in \f(CW\*(C`DHCPD_CONF_INCLUDE_FILES\*(C'\fR in
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/etc/rc.config.d/dhcpd.rc.config. These files are looked at to find out
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whether one of the config files is newer than dhcpd's pid file
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('\fBrcdhcpd probe\fR')
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.PP
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\&\fBdhcpsync\fR should actually be usable without modification. But you need to do
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some configuration, read on.
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.SH "CONFIGURATION"
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.IX Header "CONFIGURATION"
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In this example, host1 is the master, host2 is the slave.
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.PP
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A key can be generated like this:
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(save the key in /root/.ssh/dhcp-share, and press enter when asked
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for the passphrase.)
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.PP
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.Vb 11
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\& root@host1 ~ # ssh-keygen -C 'dhcp-share@host1'
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\& Generating public/private rsa1 key pair.
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\& Enter file in which to save the key (/root/.ssh/identity):
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\& /root/.ssh/dhcp-share
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\& Enter passphrase (empty for no passphrase):
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\& Enter same passphrase again:
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\& Your identification has been saved in /root/.ssh/dhcp-share.
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\& Your public key has been saved in /root/.ssh/dhcp-share.pub.
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\& The key fingerprint is:
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\& 21:11:ec:20:00:42:2f:20:7e:1f:df:6a:d1:25:3d:81 dhcp-share@host1
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\& root@host1 ~ #
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.Ve
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Now you add the key to the authorized_keys file on the slave (host2):
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.PP
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.Vb 2
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\& root@host1 ~ # cat ~/.ssh/dhcp-share.pub | ssh root@host2 \e
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\& 'mkdir -p .ssh; cat >> .ssh/authorized_keys'
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.Ve
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(This will append the key to an existing authorized_keys file, or create one.)
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.PP
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To protect the root account (you could as well use another account, of
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course), you can edit .ssh/authorized_keys on host2 like this:
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(Thereby, only the forced command can be executed, and only from host1.)
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.PP
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.Vb 9
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\& from="host1",command="rsync --server -vlogDtprc . /etc//dhcpd.con
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\& f.shared; logger dhcpsync: restarting dhcpd; /etc/init.d/dhcpd tr
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\& y-restart",no-port-forwarding,no-X11-forwarding,no-agent-forwardi
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\& ng,no-pty 1024 35 15374502219051682029939108886754918218659904062
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\& 39933745099888497383649196106925140349057243770084885129581786366
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\& 05465027720474718409180919631615923416064825206960144541025646589
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\& 06475280304001588034598721095438582948133259768243300555751330261
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\& 946744924207972755699883176592160263892584211118353855811030877 d
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\& hcp-share@host1
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.Ve
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To run \fBdhcpsync\fR, you must specify the hostname of the \f(CW\*(C`SLAVE\*(C'\fR by putting it
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into the environment,
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.PP
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.Vb 1
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\& root@host1 ~ # SLAVE=host2 dhcpsync
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.Ve
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or, alternatively, giving the name as the first argument:
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.PP
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.Vb 1
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\& root@host1 ~ # dhcpsync host2
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.Ve
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.SH "CHANGING THE DEFAULTS"
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.IX Header "CHANGING THE DEFAULTS"
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Please refer to the \s-1FILES\s0 section to see what the defaults are.
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.PP
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The name of the file to be synced can be overridden from the environment
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(bash example):
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.PP
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.Vb 1
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\& root@host1 ~ # SHARED="some_other_file" dhcpsync host2
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.Ve
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Likewise, the ssh key to be used to authenticate can be specified via the
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\&\f(CW\*(C`KEY\*(C'\fR variable.
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.SH "AUTOMATION"
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.IX Header "AUTOMATION"
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The script can be run from cron, such as:
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.PP
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.Vb 1
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\& -* * * * * root /usr/sbin/dhcpsync host2
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.Ve
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.SH "FILES"
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.IX Header "FILES"
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.Vb 2
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\& /etc/dhcpd.conf.shared default conf file that is to be synced
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\& /root/.ssh/dhcp-share default file name of the ssh1 private key
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.Ve
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.SH "AUTHORS"
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.IX Header "AUTHORS"
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.Vb 1
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\& Peter Poeml <poeml@suse.de>
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.Ve
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.SH "BUGS"
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.IX Header "BUGS"
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If you feel that this script could be improved, please submit a bug report!
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.PP
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Someone who has access to the private key and the master's \s-1IP\s0 address can
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overwrite the configuration file, possibly causing harm.
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.PP
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After an offline time of the secondary machine, it would in fact have to pull a fresh
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config before starting up on next reboot.
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.SH "DISCLAIMER"
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.IX Header "DISCLAIMER"
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\&\fBdhcpsync\fR is provided ``\s-1AS\s0 \s-1IS\s0'' and any express or implied warranties,
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including, but not limited to, the implied warranties of merchantability
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and fitness for a particular purpose are disclaimed.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIdhcpd\fR\|(8), /usr/share/doc/packages/dhcp/*
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