Lab 16.1 - LXC - no network in containers, cgroup controller missing
Hi,
I'm trying to follow the LXC lab but after some trials and google searching I'm still with no networking containers.
Here my configs:
root@alex-kvm:~# hostnamectl status Static hostname: alex-kvm Icon name: computer-vm Chassis: vm Machine ID: 842c7ef66a9c4d7b88ec23e7c342ce7c Boot ID: 11ef0d3089fa49f9b8b6dd474f04c73e Virtualization: kvm Operating System: Ubuntu 21.10 Kernel: Linux 5.13.0-20-generic Architecture: x86-64 Hardware Vendor: QEMU Hardware Model: Standard PC _Q35 + ICH9, 2009_
root@alex-kvm:~# lxc-checkconfig LXC version 4.0.10 Kernel configuration not found at /proc/config.gz; searching... Kernel configuration found at /boot/config-5.13.0-20-generic --- Namespaces --- Namespaces: enabled Utsname namespace: enabled Ipc namespace: enabled Pid namespace: enabled User namespace: enabled Network namespace: enabled --- Control groups --- Cgroups: enabled Cgroup namespace: enabled Cgroup v1 mount points: Cgroup v2 mount points: /sys/fs/cgroup Cgroup v1 systemd controller: missing Cgroup v1 freezer controller: missing Cgroup ns_cgroup: required Cgroup device: enabled Cgroup sched: enabled Cgroup cpu account: enabled Cgroup memory controller: enabled Cgroup cpuset: enabled --- Misc --- Veth pair device: enabled, loaded Macvlan: enabled, not loaded Vlan: enabled, not loaded Bridges: enabled, loaded Advanced netfilter: enabled, loaded CONFIG_NF_NAT_IPV4: missing CONFIG_NF_NAT_IPV6: missing CONFIG_IP_NF_TARGET_MASQUERADE: enabled, not loaded CONFIG_IP6_NF_TARGET_MASQUERADE: enabled, not loaded CONFIG_NETFILTER_XT_TARGET_CHECKSUM: enabled, loaded CONFIG_NETFILTER_XT_MATCH_COMMENT: enabled, not loaded FUSE (for use with lxcfs): enabled, not loaded --- Checkpoint/Restore --- checkpoint restore: enabled CONFIG_FHANDLE: enabled CONFIG_EVENTFD: enabled CONFIG_EPOLL: enabled CONFIG_UNIX_DIAG: enabled CONFIG_INET_DIAG: enabled CONFIG_PACKET_DIAG: enabled CONFIG_NETLINK_DIAG: enabled File capabilities: Note : Before booting a new kernel, you can check its configuration usage : CONFIG=/path/to/config /usr/bin/lxc-checkconfig
# lxc-create -n ubby -t ubuntu -o /var/log/lxc/lxc-ubby.log
lxc-start --version => 4.0.10
# lxc-start -n ubby -F /bin/bash root@ubby:/# ping google.com ping: google.com: Temporary failure in name resolution root@ubby:/# ip addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0@if19: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether 00:16:3e:e9:a6:0c brd ff:ff:ff:ff:ff:ff link-netnsid 0 inet6 fe80::216:3eff:fee9:a60c/64 scope link valid_lft forever preferred_lft forever root@ubby:/# ip route root@ubby:/# root@ubby:/# cat /etc/hosts 127.0.0.1 localhost 127.0.1.1 ubby # The following lines are desirable for IPv6 capable hosts ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters
# cat /proc/1/mounts |grep cgroup cgroup2 /sys/fs/cgroup cgroup2 rw,nosuid,nodev,noexec,relatime 0 0
Following this issue I have also tried to run the lxc-start inside a systemd-run command, but being in a kvm machine it doesn't work
# systemd-run --user --scope -p "Delegate=yes" lxc-start -n ubby -F /bin/bash Failed to connect to bus: $DBUS_SESSION_BUS_ADDRESS and $XDG_RUNTIME_DIR not defined (consider using --machine=<user>@.host --user to connect to bus of other user)
Any help?
Comments
-
Not sure which cgroup you are looking at,
I see Ubuntu 21.10 and lxc 4.10.
We use long term releases for labs, so there may be some surprises with 21.10.Depending on which machine or VM you are running on, connect the network in /etc/lxc/default then re-create the lxc machine.
Let me know. Lee
0 -
Please show us your "/etc/lxc/default.conf" file.
I'm using the bridge set up by libvirt and connecting the lxc-container to it; my file is below, notice the lxc.net.0.link value.root@ubuntu:~# cat /etc/lxc/default.conf
lxc.net.0.type = veth
lxc.net.0.link = virbr0
lxc.net.0.flags = up
lxc.net.0.hwaddr = 00:16:3e:xx:xx:xx
root@ubuntu:~#And my containers have ip addresses in the same domain as KVM.
root@ubuntu:~# lxc-ls -f
NAME STATE AUTOSTART GROUPS IPV4 IPV6 UNPRIVILEGED
bucket RUNNING 0 - 192.168.122.37 - false
test01 RUNNING 0 - 192.168.122.143 - false
test02 RUNNING 0 - 192.168.122.93 - false
root@ubuntu:~#Lee
0
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