LXC migrate between hosts
5,291
From the errors you're getting it looks like the 2nd host is missing the network bridge lxcbr0.
Other things to consider:
- Also what steps did you follow to "move" the container?
- Did you copy both the container's file and .conf files?
Did you use a command like this to recreate this host's container on the 2nd host?
$ lxc-create -t TEMPLATE -f lxc.conf -n CONTAINERAlso I would compare the following things between the 2 hosts and make sure that everything is setup consistently between the 2 systems. Use the following commands on both hosts:
$ ifconfig -a $ brctl show $ ls -l /var/log/upstart/lxc* $ cat /etc/default/lxc $ cat /etc/init/lxc-net.conf
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Author by
Vasile Alexandru Peste
Updated on September 18, 2022Comments
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Vasile Alexandru Peste over 1 year
I had setup a testsystem with LXC and installed a webserver etc. that all was not the problem. But now I want to swich to another host system also I compressed /var/lib/lxc/webserver and copied it to the other host. But there i got serval errors:
lxc-start: failed to attach 'vethO5HJ2b' to the bridge 'lxcbr0' : No such device lxc-start: failed to create netdev lxc-start: failed to create the network lxc-start: failed to spawn 'webserver'In the config i did found settings for network. Any Ideas to fix the network issue or exits a better way to migrate between hosts ?
ifconfig -a
Host1 (VM is working here)
eth0 Link encap:Ethernet Hardware Adresse 00:25:90:d2:c2:d6 inet Adresse:85.xxx.xxx.43 Bcast:85.xxx.xxx.43 Maske:255.255.255.255 inet6-Adresse: fe80::225:90ff:fed2:c2d6/64 Gültigkeitsbereich:Verbindung UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1 RX packets:186831047 errors:0 dropped:0 overruns:0 frame:0 TX packets:170397357 errors:0 dropped:0 overruns:0 carrier:0 Kollisionen:0 Sendewarteschlangenlänge:1000 RX-Bytes:14641876568 (14.6 GB) TX-Bytes:32363758586 (32.3 GB) Speicher:f7100000-f7180000 eth0:1 Link encap:Ethernet Hardware Adresse 00:25:90:d2:c2:d6 inet Adresse:81.xxx.xxx.247 Bcast:81.xxx.xxx.255 Maske:255.255.255.255 UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1 Speicher:f7100000-f7180000 eth1 Link encap:Ethernet Hardware Adresse 00:25:90:d2:c2:d7 BROADCAST MULTICAST MTU:1500 Metrik:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 Kollisionen:0 Sendewarteschlangenlänge:1000 RX-Bytes:0 (0.0 B) TX-Bytes:0 (0.0 B) Interrupt:20 Speicher:f7200000-f7220000 lo Link encap:Lokale Schleife inet Adresse:127.0.0.1 Maske:255.0.0.0 inet6-Adresse: ::1/128 Gültigkeitsbereich:Maschine UP LOOPBACK RUNNING MTU:65536 Metrik:1 RX packets:22574 errors:0 dropped:0 overruns:0 frame:0 TX packets:22574 errors:0 dropped:0 overruns:0 carrier:0 Kollisionen:0 Sendewarteschlangenlänge:0 RX-Bytes:4393152 (4.3 MB) TX-Bytes:4393152 (4.3 MB) lxcbr0 Link encap:Ethernet Hardware Adresse ee:2c:00:bf:f0:a9 inet Adresse:10.0.3.1 Bcast:10.0.3.255 Maske:255.255.255.0 inet6-Adresse: fe80::ec2c:ff:febf:f0a9/64 Gültigkeitsbereich:Verbindung UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 Kollisionen:0 Sendewarteschlangenlänge:0 RX-Bytes:0 (0.0 B) TX-Bytes:468 (468.0 B) bridge name bridge id STP enabled interfaces lxcbr0 8000.000000000000 no ls: Zugriff auf /var/log/upstart/lxc* nicht möglich: Datei oder Verzeichnis nicht gefunden (in English, not found) $ brctl show bridge name bridge id STP enabled interfaces lxcbr0 8000.000000000000 no minecraft@h2210663:~$ ls -l /var/log/upstart/lxc* ls: Zugriff auf /var/log/upstart/lxc* nicht möglich: Datei oder Verzeichnis nicht gefunden minecraft@h2210663:~$ cat /etc/default/lxc # MIRROR to be used by ubuntu template at container creation: # Leaving it undefined is fine #MIRROR="http://archive.ubuntu.com/ubuntu" # or #MIRROR="http://<host-ip-addr>:3142/archive.ubuntu.com/ubuntu" # LXC_AUTO - whether or not to start containers symlinked under # /etc/lxc/auto LXC_AUTO="true" # Leave USE_LXC_BRIDGE as "true" if you want to use lxcbr0 for your # containers. Set to "false" if you'll use virbr0 or another existing # bridge, or mavlan to your host's NIC. USE_LXC_BRIDGE="true" # If you change the LXC_BRIDGE to something other than lxcbr0, then # you will also need to update your /etc/lxc/default.conf as well as the # configuration (/var/lib/lxc/<container>/config) for any containers # already created using the default config to reflect the new bridge # name. # If you have the dnsmasq daemon installed, you'll also have to update # /etc/dnsmasq.d/lxc and restart the system wide dnsmasq daemon. LXC_BRIDGE="lxcbr0" LXC_ADDR="10.0.3.1" LXC_NETMASK="255.255.255.0" LXC_NETWORK="10.0.3.0/24" LXC_DHCP_RANGE="10.0.3.2,10.0.3.254" LXC_DHCP_MAX="253" LXC_SHUTDOWN_TIMEOUT=120 $ cat /etc/init/lxc-net.conf description "lxc network" author "Serge Hallyn <[email protected]>" start on starting lxc stop on stopped lxc env USE_LXC_BRIDGE="false" env LXC_BRIDGE="lxcbr0" env LXC_ADDR="10.0.3.1" env LXC_NETMASK="255.255.255.0" env LXC_NETWORK="10.0.3.0/24" env LXC_DHCP_RANGE="10.0.3.2,10.0.3.254" env LXC_DHCP_MAX="253" env varrun="/var/run/lxc" pre-start script [ -f /etc/default/lxc ] && . /etc/default/lxc [ "x$USE_LXC_BRIDGE" = "xtrue" ] || { stop; exit 0; } cleanup() { # dnsmasq failed to start, clean up the bridge iptables -t nat -D POSTROUTING -s ${LXC_NETWORK} ! -d ${LXC_NETWORK} -j MASQUERADE || true ifconfig ${LXC_BRIDGE} down || true brctl delbr ${LXC_BRIDGE} || true } if [ -d /sys/class/net/${LXC_BRIDGE} ]; then if [ ! -f ${varrun}/network_up ]; then # bridge exists, but we didn't start it stop; fi exit 0; fi # set up the lxc network echo 1 > /proc/sys/net/ipv4/ip_forward mkdir -p ${varrun} brctl addbr ${LXC_BRIDGE} ifconfig ${LXC_BRIDGE} ${LXC_ADDR} netmask ${LXC_NETMASK} up iptables -t nat -A POSTROUTING -s ${LXC_NETWORK} ! -d ${LXC_NETWORK} -j MASQUERADE dnsmasq -u lxc-dnsmasq --strict-order --bind-interfaces --pid-file=${varrun}/dnsmasq.pid --conf-file= --listen-address ${LXC_ADDR} --dhcp-range ${LXC_DHCP_RANGE} --dhcp-lease-max=${LXC_DHCP_MAX} --dhcp-no-override --except-interface=lo --interface=${LXC_BRIDGE} --dhcp-leasefile=/var/lib/misc/dnsmasq.${LXC_BRIDGE}.leases --dhcp-authoritative || cleanup touch ${varrun}/network_up end script post-stop script [ -f /etc/default/lxc ] && . /etc/default/lxc [ -f "${varrun}/network_up" ] || exit 0; # if $LXC_BRIDGE has attached interfaces, don't shut it down ls /sys/class/net/${LXC_BRIDGE}/brif/* > /dev/null 2>&1 && exit 0; if [ -d /sys/class/net/${LXC_BRIDGE} ]; then ifconfig ${LXC_BRIDGE} down iptables -t nat -D POSTROUTING -s ${LXC_NETWORK} ! -d ${LXC_NETWORK} -j MASQUERADE || true pid=`cat ${varrun}/dnsmasq.pid 2>/dev/null` && kill -9 $pid || true rm -f ${varrun}/dnsmasq.pid brctl delbr ${LXC_BRIDGE} fi rm -f ${varrun}/network_up end scriptHost2 (destination)
eth0 Link encap:Ethernet Hardware Adresse 00:25:90:ae:09:6a inet Adresse:2xx.xx4.xxx.217 Bcast:2xx.xx4.xxx.255 Maske:255.255.255.192 inet6-Adresse: fe80::225:90ff:feae:96a/64 Gültigkeitsbereich:Verbindung UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1 RX packets:2876153658 errors:0 dropped:48779 overruns:0 frame:0 TX packets:2680725017 errors:0 dropped:0 overruns:0 carrier:0 Kollisionen:0 Sendewarteschlangenlänge:1000 RX bytes:234344379020 (218.2 GiB) TX bytes:710758489234 (661.9 GiB) Interrupt:16 Speicher:df900000-df920000 eth0:1 Link encap:Ethernet Hardware Adresse 00:25:90:ae:09:6a inet Adresse:2xx.xx4.xxx.252 Bcast:2xx.xx4.xxx.255 Maske:255.255.255.192 UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1 Interrupt:16 Speicher:df900000-df920000 eth1 Link encap:Ethernet Hardware Adresse 00:25:90:ae:09:6b BROADCAST MULTICAST MTU:1500 Metrik:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 Kollisionen:0 Sendewarteschlangenlänge:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:20 Speicher:dfa00000-dfa20000 lo Link encap:Lokale Schleife inet Adresse:127.0.0.1 Maske:255.0.0.0 inet6-Adresse: ::1/128 Gültigkeitsbereich:Maschine UP LOOPBACK RUNNING MTU:16436 Metrik:1 RX packets:738956166 errors:0 dropped:0 overruns:0 frame:0 TX packets:738956166 errors:0 dropped:0 overruns:0 carrier:0 Kollisionen:0 Sendewarteschlangenlänge:0 RX bytes:65605834297 (61.1 GiB) TX bytes:65605834297 (61.1 GiB) $ brctl show bridge name bridge id STP enabled interfaces $ ls: Zugriff auf /var/log/upstart/lxc* nicht möglich: Datei oder Verzeichnis nicht gefunden (in English, not found) $ cat /etc/default/lxc # /etc/default/lxc LXC_AUTO="true" LXC_DIRECTORY="/ssd/lib/lxc" $ cat /etc/init/lxc-net.conf cat: /etc/init/lxc-net.conf: Datei oder Verzeichnis nicht gefunden (in English, not found)