DHCP-Abschnitt eingefügt
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aufgabe3.2/30-hostname
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155
aufgabe3.2/30-hostname
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# Set the hostname from DHCP data if required
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# A hostname can either be a short hostname or a FQDN.
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# hostname_fqdn=true
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hostname_fqdn=false
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# hostname_fqdn=server
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# A value of server means just what the server says, don't manipulate it.
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# This could lead to an inconsistent hostname on a DHCPv4 and DHCPv6 network
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# where the DHCPv4 hostname is short and the DHCPv6 has an FQDN.
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# DHCPv6 has no hostname option.
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# RFC4702 section 3.1 says FQDN should be prefered over hostname.
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#
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# As such, the default is hostname_fqdn=true so that a consistent hostname
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# is always assigned.
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: ${hostname_fqdn:=true}
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# Some systems don't have hostname(1)
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_hostname()
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{
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local name=
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if [ -z "$1" ]; then
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if type hostname >/dev/null 2>&1; then
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hostname
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elif [ -r /proc/sys/kernel/hostname ]; then
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read name </proc/sys/kernel/hostname && echo "$name"
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elif sysctl kern.hostname >/dev/null 2>&1; then
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sysctl -n kern.hostname
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elif sysctl kernel.hostname >/dev/null 2>&1; then
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sysctl -n kernel.hostname
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else
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return 1
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fi
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return $?
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fi
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# Always prefer hostname(1) if we have it
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if type hostname >/dev/null 2>&1; then
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#hostname "$1"
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hostnamectl set-hostname "$1"
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elif [ -w /proc/sys/kernel/hostname ]; then
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echo "$1" >/proc/sys/kernel/hostname
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elif sysctl kern.hostname >/dev/null 2>&1; then
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sysctl -w "kern.hostname=$1"
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elif sysctl kernel.hostname >/dev/null 2>&1; then
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sysctl -w "kernel.hostname=$1"
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else
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# We know this will fail, but it will now fail
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# with an error to stdout
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hostname "$1"
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fi
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}
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need_hostname()
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{
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local hostname hfqdn=false hshort=false
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case "$force_hostname" in
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[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|1) return 0;;
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esac
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hostname="$(_hostname)"
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case "$hostname" in
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""|"(none)"|localhost|localhost.localdomain) return 0;;
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esac
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case "$hostname_fqdn" in
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[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|1) hfqdn=true;;
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[Ss][Ee][Rr][Vv][Ee][Rr]) ;;
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*) hshort=true;;
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esac
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if [ -n "$old_fqdn" ]; then
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if ${hfqdn} || ! ${hsort}; then
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[ "$hostname" = "$old_fqdn" ]
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else
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[ "$hostname" = "${old_fqdn%%.*}" ]
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fi
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elif [ -n "$old_host_name" ]; then
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if ${hfqdn}; then
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if [ -n "$old_domain_name" -a \
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"$old_host_name" = "${old_host_name#*.}" ]
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then
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[ "$hostname" = \
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"$old_host_name.$old_domain_name" ]
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else
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[ "$hostname" = "$old_host_name" ]
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fi
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elif ${hshort}; then
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[ "$hostname" = "${old_host_name%%.*}" ]
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else
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[ "$hostname" = "$old_host_name" ]
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fi
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else
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# No old hostname
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false
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fi
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}
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try_hostname()
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{
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if valid_domainname "$1"; then
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_hostname "$1"
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else
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syslog err "Invalid hostname: $1"
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fi
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}
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set_hostname()
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{
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local hfqdn=false hshort=false
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need_hostname || return
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case "$hostname_fqdn" in
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[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|1) hfqdn=true;;
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"") ;;
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*) hshort=true;;
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esac
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if [ -n "$new_fqdn" ]; then
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if ${hfqdn} || ! ${hshort}; then
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try_hostname "$new_fqdn"
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else
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try_hostname "${new_fqdn%%.*}"
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fi
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elif [ -n "$new_host_name" ]; then
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if ${hfqdn}; then
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if [ -n "$new_domain_name" -a \
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"$new_host_name" = "${new_host_name#*.}" ]
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then
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try_hostname "$new_host_name.$new_domain_name"
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else
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try_hostname "$new_host_name"
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fi
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elif ${hshort}; then
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try_hostname "${new_host_name%%.*}"
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else
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try_hostname "$new_host_name"
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fi
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fi
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}
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# For ease of use, map DHCP6 names onto our DHCP4 names
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case "$reason" in
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BOUND6|RENEW6|REBIND6|REBOOT6|INFORM6)
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new_fqdn="$new_dhcp6_fqdn"
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;;
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esac
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if $if_up; then
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set_hostname
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fi
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112
aufgabe3.2/dhcpd.conf
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112
aufgabe3.2/dhcpd.conf
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# dhcpd.conf
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#
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# Sample configuration file for ISC dhcpd
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#
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# option definitions common to all supported networks...
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option domain-name "zotac";
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option domain-name-servers zotac0.zotac;
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default-lease-time 600;
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max-lease-time 7200;
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# Use this to enble / disable dynamic dns updates globally.
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#ddns-update-style none;
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# If this DHCP server is the official DHCP server for the local
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# network, the authoritative directive should be uncommented.
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#authoritative;
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# Use this to send dhcp log messages to a different log file (you also
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# have to hack syslog.conf to complete the redirection).
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log-facility local7;
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# No service will be given on this subnet, but declaring it helps the
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# DHCP server to understand the network topology.
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subnet 10.20.0.0 netmask 255.255.255.0 {
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# range 10.20.0.100 10.20.0.200;
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option routers zotac0.zotac;
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}
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# This is a very basic subnet declaration.
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#subnet 10.254.239.0 netmask 255.255.255.224 {
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# range 10.254.239.10 10.254.239.20;
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# option routers rtr-239-0-1.example.org, rtr-239-0-2.example.org;
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#}
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# This declaration allows BOOTP clients to get dynamic addresses,
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# which we don't really recommend.
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#subnet 10.254.239.32 netmask 255.255.255.224 {
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# range dynamic-bootp 10.254.239.40 10.254.239.60;
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# option broadcast-address 10.254.239.31;
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# option routers rtr-239-32-1.example.org;
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#}
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# A slightly different configuration for an internal subnet.
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#subnet 10.5.5.0 netmask 255.255.255.224 {
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# range 10.5.5.26 10.5.5.30;
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# option domain-name-servers ns1.internal.example.org;
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# option domain-name "internal.example.org";
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# option routers 10.5.5.1;
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# option broadcast-address 10.5.5.31;
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# default-lease-time 600;
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# max-lease-time 7200;
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#}
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# Hosts which require special configuration options can be listed in
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# host statements. If no address is specified, the address will be
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# allocated dynamically (if possible), but the host-specific information
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# will still come from the host declaration.
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host zotac1 {
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hardware ethernet 00:1c:c0:d5:a9:ee;
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fixed-address zotac1.zotac;
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use-host-decl-names true;
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}
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#host passacaglia {
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# hardware ethernet 0:0:c0:5d:bd:95;
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# filename "vmunix.passacaglia";
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# server-name "toccata.fugue.com";
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#}
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# Fixed IP addresses can also be specified for hosts. These addresses
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# should not also be listed as being available for dynamic assignment.
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# Hosts for which fixed IP addresses have been specified can boot using
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# BOOTP or DHCP. Hosts for which no fixed address is specified can only
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# be booted with DHCP, unless there is an address range on the subnet
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# to which a BOOTP client is connected which has the dynamic-bootp flag
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# set.
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#host fantasia {
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# hardware ethernet 08:00:07:26:c0:a5;
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# fixed-address fantasia.fugue.com;
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#}
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# You can declare a class of clients and then do address allocation
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# based on that. The example below shows a case where all clients
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# in a certain class get addresses on the 10.17.224/24 subnet, and all
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# other clients get addresses on the 10.0.29/24 subnet.
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#class "foo" {
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# match if substring (option vendor-class-identifier, 0, 4) = "SUNW";
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#}
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#
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#shared-network 224-29 {
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# subnet 10.17.224.0 netmask 255.255.255.0 {
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# option routers rtr-224.example.org;
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# }
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# subnet 10.0.29.0 netmask 255.255.255.0 {
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# option routers rtr-29.example.org;
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# }
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# pool {
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# allow members of "foo";
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# range 10.17.224.10 10.17.224.250;
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# }
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# pool {
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# deny members of "foo";
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# range 10.0.29.10 10.0.29.230;
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# }
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#}
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12
aufgabe3.2/dhcpd4@.service
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12
aufgabe3.2/dhcpd4@.service
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[Unit]
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Description=IPv4 DHCP server
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After=network.target
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[Service]
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Type=forking
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PIDFile=/run/dhcpd4.pid
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ExecStart=/usr/sbin/dhcpd -4 -q -pf /run/dhcpd4.pid %I
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KillSignal=SIGINT
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[Install]
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WantedBy=multi-user.target
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@ -94,3 +94,4 @@ Nach dem Burnin sollte der Compute-Node automatisch heruntergefahren werden. Daz
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\shellcmd{shutdown -P 2880}
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\pagebreak
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@ -1,4 +1,54 @@
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\subsubsection{DNS}
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\subsection{DHCP}
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\subsubsection{Server}
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\begin{sloppypar}
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Wir haben uns für {\tt dhcpd} als DHCP-Server entschieden. Zur Konfiguration haben wir in {\tt /etc/dhcpd.conf} (siehe {\tt aufgabe3.2}) den Domain-Namen {\tt zotac} eintragen und den Headnode als DNS-Server eingestellt.
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\end{sloppypar}
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Des Weiteren haben wir das Subnet {\tt 10.20.0.0/24} deklariert und wiederum den Headnode als verantwortlichen Router eingetragen.
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Die Pro-Host-Konfiguration sieht bei uns wie folgt aus:
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\begin{lstlisting}
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host zotac<X> {
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hardware ethernet <MAC-Adresse>;
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fixed-address zotac<X>.zotac;
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use-host-decl-names true;
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}
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\end{lstlisting}
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Damit ist sichergestellt, dass die Hosts die im Cluster-Layout spezifizierte IP-Adresse entsprechend ihrer MAC-Adresse zugewiesen bekommen und gleichzeitig ihren Hostnamen gesagt bekommen. (Die IP-Adresse holt sich der DHCP-Server vom lokalen DNS-Server.)
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Zusätzlich haben wir das bereits in der Installation enthaltene {\tt systemd}-Service-File entsprechend so angepasst, dass man beim Starten und Aktivieren des Dienstes spezifizieren kann, auf welchem Netzwerk-Interface der Dienst hören soll. (siehe {\tt aufgabe3.2/dhcpd4@.service})
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Starten kann man den Dienst nun mit:
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\shellcmd{systemctl start dhcpd4@eth1}
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wobei {\tt eth1} das Interface ist, das am internen LAN angeschlossen ist.
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\subsubsection{Client}
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\begin{sloppypar}
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Als Client verwenden wir {\tt dhcpcd}. \\
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Um den Hostnamen richtig vom DHCP-Server abholen zu können, mussten wir in {\tt /usr/lib/dhcpcd/dhcpcd-hooks/30-hostname} (siehe {\tt aufgabe3.2/30-hostname}) noch die Option {\tt hostname\_fqdn=false} setzen, damit der kurze Hostname ({\tt zotac<X>} statt {\tt zotac<X>.zotac}) verwendet wird. \\
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Außerdem haben wir noch die Zeile:
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\begin{center}
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{\tt hostname \grqq{\$}1\grqq}
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\end{center}
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durch:
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\begin{center}
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{\tt hostnamectl set-hostname \grqq{\$}1\grqq}
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\end{center}
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ersetzt, damit der bezogene Hostname automatisch persistent ({\tt /etc/hostname}) gesetzt wird.
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\end{sloppypar}
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\subsection{DNS}
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\label{ssub:dns}
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Als DNS-Server haben wir {\tt Bind} installiert und eingerichtet.
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@ -1 +1 @@
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Subproject commit 7abd329ac66148a9b6adcf5c022e84893b72a36b
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Subproject commit b63daf5cbc2272cd20277a157bf025c695a5bb45
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2
logs
2
logs
@ -1 +1 @@
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Subproject commit e67584ad2c8222932e65a5d340e3469780acc3b4
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Subproject commit 4577c74a7b11d23834a2fd53d0f0646e0d6d0622
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@ -113,7 +113,7 @@ pre {
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<section id="bericht">
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<h2>Bericht</h2>
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<a href="uploads/bericht.pdf" class="pure-button
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pure-button-primary">Download</a> <p>Stand: 13:38:39 07.11.2013</p>
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pure-button-primary">Download</a> <p>Stand: 10:38:02 21.11.2013</p>
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</section>
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<section id="git">
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<h2>Git-Zugriff</h2>
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