Since a few years I’m packaging LXD and the latest version of LXC as RPM for Fedora and CentOS via COPR (ganto/lxc3). While there was never a big issue to build LXD on Fedora, CentOS 7 is reaching an age where this becomes more and more of an issue (e.g. #5993). The LXD developers always seem interested in such reports and always find a way to fix things as they popped up, but lxd-3.19 now introduce new filesystem and seccomp code that cannot be built anymore against a stock CentOS 7 build root.
I still found a way to build it by patching out support for MS_LAZYMOUNT and using newer kernel headers provided by the ELRepo repository but I’m unsure about the usability of the created binaries. I superficially tested the resulting binaries on a fresh CentOS 7 and I couldn’t find anything broken on first sight at least for containers. This might be different for virtual machines because qemu on CentOS 7 doesn’t understand the generated VM configuration, but I haven’t looked closely into that yet. Generally, I’m unsure about how to continue with LXD on CentOS 7. I’m personally not using it but it was once a much requested feature.
Are there (still) users who are using my COPR repository for CentOS 7? Would you mind if I simply remove support for CentOS 7 from my COPR?
On the other side, are the developers (@stgraber, @brauner) still interested in getting “bug” reports for CentOS 7. How much depends your code on the “missing” features on a stock CentOS 7 kernel? Is there any release that you would say is still safe to run on CentOS 7 but anything newer is likely broken? Btw. the info of an LXD installed via RPM running on a CentOS 7 (using stock kernel):
# lxc info
config:
images.auto_update_interval: "0"
api_extensions:
- storage_zfs_remove_snapshots
- container_host_shutdown_timeout
- container_stop_priority
- container_syscall_filtering
- auth_pki
- container_last_used_at
- etag
- patch
- usb_devices
- https_allowed_credentials
- image_compression_algorithm
- directory_manipulation
- container_cpu_time
- storage_zfs_use_refquota
- storage_lvm_mount_options
- network
- profile_usedby
- container_push
- container_exec_recording
- certificate_update
- container_exec_signal_handling
- gpu_devices
- container_image_properties
- migration_progress
- id_map
- network_firewall_filtering
- network_routes
- storage
- file_delete
- file_append
- network_dhcp_expiry
- storage_lvm_vg_rename
- storage_lvm_thinpool_rename
- network_vlan
- image_create_aliases
- container_stateless_copy
- container_only_migration
- storage_zfs_clone_copy
- unix_device_rename
- storage_lvm_use_thinpool
- storage_rsync_bwlimit
- network_vxlan_interface
- storage_btrfs_mount_options
- entity_description
- image_force_refresh
- storage_lvm_lv_resizing
- id_map_base
- file_symlinks
- container_push_target
- network_vlan_physical
- storage_images_delete
- container_edit_metadata
- container_snapshot_stateful_migration
- storage_driver_ceph
- storage_ceph_user_name
- resource_limits
- storage_volatile_initial_source
- storage_ceph_force_osd_reuse
- storage_block_filesystem_btrfs
- resources
- kernel_limits
- storage_api_volume_rename
- macaroon_authentication
- network_sriov
- console
- restrict_devlxd
- migration_pre_copy
- infiniband
- maas_network
- devlxd_events
- proxy
- network_dhcp_gateway
- file_get_symlink
- network_leases
- unix_device_hotplug
- storage_api_local_volume_handling
- operation_description
- clustering
- event_lifecycle
- storage_api_remote_volume_handling
- nvidia_runtime
- container_mount_propagation
- container_backup
- devlxd_images
- container_local_cross_pool_handling
- proxy_unix
- proxy_udp
- clustering_join
- proxy_tcp_udp_multi_port_handling
- network_state
- proxy_unix_dac_properties
- container_protection_delete
- unix_priv_drop
- pprof_http
- proxy_haproxy_protocol
- network_hwaddr
- proxy_nat
- network_nat_order
- container_full
- candid_authentication
- backup_compression
- candid_config
- nvidia_runtime_config
- storage_api_volume_snapshots
- storage_unmapped
- projects
- candid_config_key
- network_vxlan_ttl
- container_incremental_copy
- usb_optional_vendorid
- snapshot_scheduling
- container_copy_project
- clustering_server_address
- clustering_image_replication
- container_protection_shift
- snapshot_expiry
- container_backup_override_pool
- snapshot_expiry_creation
- network_leases_location
- resources_cpu_socket
- resources_gpu
- resources_numa
- kernel_features
- id_map_current
- event_location
- storage_api_remote_volume_snapshots
- network_nat_address
- container_nic_routes
- rbac
- cluster_internal_copy
- seccomp_notify
- lxc_features
- container_nic_ipvlan
- network_vlan_sriov
- storage_cephfs
- container_nic_ipfilter
- resources_v2
- container_exec_user_group_cwd
- container_syscall_intercept
- container_disk_shift
- storage_shifted
- resources_infiniband
- daemon_storage
- instances
- image_types
- resources_disk_sata
- clustering_roles
- images_expiry
- resources_network_firmware
- backup_compression_algorithm
- ceph_data_pool_name
- container_syscall_intercept_mount
- compression_squashfs
- container_raw_mount
- container_nic_routed
- container_syscall_intercept_mount_fuse
- container_disk_ceph
- virtual-machines
- image_profiles
- clustering_architecture
- resources_disk_id
- storage_lvm_stripes
- vm_boot_priority
- unix_hotplug_devices
- api_filtering
api_status: stable
api_version: "1.0"
auth: trusted
public: false
auth_methods:
- tls
environment:
addresses: []
architectures:
- x86_64
- i686
certificate: | [...]
certificate_fingerprint: [...]
driver: lxc
driver_version: 3.2.1
kernel: Linux
kernel_architecture: x86_64
kernel_features:
netnsid_getifaddrs: "false"
seccomp_listener: "false"
seccomp_listener_continue: "false"
shiftfs: "false"
uevent_injection: "false"
unpriv_fscaps: "true"
kernel_version: 3.10.0-1062.9.1.el7.x86_64
lxc_features:
cgroup2: "false"
mount_injection_file: "true"
network_gateway_device_route: "true"
network_ipvlan: "true"
network_l2proxy: "true"
network_phys_macvlan_mtu: "true"
network_veth_router: "true"
seccomp_notify: "true"
project: default
server: lxd
server_clustered: false
server_name: localhost.localdomain
server_pid: 2042
server_version: "3.20"
storage: dir
storage_version: "1"
Thanks a lot for your feedback.
Cheers, ganto
) and the default configuration used by LXD. I still have to investigate if this can be mitigated by a customized profile or if this needs some code adjustments to. I’ll try that in the coming weeks.