[containerd] Simplify limiting number of open files per container (#9319)
by setting a default runtime spec with a patch for RLIMIT_NOFILE. - Introduces containerd_base_runtime_spec_rlimit_nofile. - Generates base_runtime_spec on-the-fly, to use the containerd version of the node.
This commit is contained in:
Ilya Margolin
GitHub
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@ -64,14 +64,17 @@ is a list of such dictionaries.
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Default runtime can be changed by setting `containerd_default_runtime`.
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#### base_runtime_spec
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#### Base runtime specs and limiting number of open files
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`base_runtime_spec` key in a runtime dictionary can be used to explicitly
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specify a runtime spec json file. We ship the default one which is generated
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with `ctr oci spec > /etc/containerd/cri-base.json`. It will be used if you set
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`base_runtime_spec: cri-base.json`. The main advantage of doing so is the presence of
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`rlimits` section in this configuration, which will restrict the maximum number
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of file descriptors(open files) per container to 1024.
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`base_runtime_spec` key in a runtime dictionary is used to explicitly
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specify a runtime spec json file. `runc` runtime has it set to `cri-base.json`,
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which is generated with `ctr oci spec > /etc/containerd/cri-base.json` and
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updated to include a custom setting for maximum number of file descriptors per
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container.
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You can change maximum number of file descriptors per container for the default
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`runc` runtime by setting the `containerd_base_runtime_spec_rlimit_nofile`
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variable.
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You can tune many more [settings][runtime-spec] by supplying your own file name and content with `containerd_base_runtime_specs`:
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@ -15,7 +15,7 @@ containerd_runc_runtime:
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type: "io.containerd.runc.v2"
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engine: ""
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root: ""
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# base_runtime_spec: cri-base.json # use this to limit number of file descriptors per container
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base_runtime_spec: cri-base.json
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options:
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systemdCgroup: "{{ containerd_use_systemd_cgroup | ternary('true', 'false') }}"
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@ -26,8 +26,17 @@ containerd_additional_runtimes: []
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# engine: ""
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# root: ""
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containerd_base_runtime_spec_rlimit_nofile: 16384
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containerd_default_base_runtime_spec_patch:
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process:
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rlimits:
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- type: RLIMIT_NOFILE
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hard: "{{ containerd_base_runtime_spec_rlimit_nofile }}"
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soft: "{{ containerd_base_runtime_spec_rlimit_nofile }}"
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containerd_base_runtime_specs:
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cri-base.json: "{{ lookup('file', 'cri-base.json') }}"
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cri-base.json: "{{ containerd_default_base_runtime_spec | combine(containerd_default_base_runtime_spec_patch,recursive=1) }}"
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containerd_grpc_max_recv_message_size: 16777216
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containerd_grpc_max_send_message_size: 16777216
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@ -1,214 +0,0 @@
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{
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"ociVersion": "1.0.2-dev",
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"process": {
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"user": {
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"uid": 0,
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"gid": 0
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},
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"cwd": "/",
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"capabilities": {
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"bounding": [
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"CAP_CHOWN",
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"CAP_DAC_OVERRIDE",
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"CAP_FSETID",
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"CAP_FOWNER",
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"CAP_MKNOD",
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"CAP_NET_RAW",
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"CAP_SETGID",
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"CAP_SETUID",
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"CAP_SETFCAP",
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"CAP_SETPCAP",
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"CAP_NET_BIND_SERVICE",
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"CAP_SYS_CHROOT",
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"CAP_KILL",
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"CAP_AUDIT_WRITE"
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],
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"effective": [
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"CAP_CHOWN",
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"CAP_DAC_OVERRIDE",
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"CAP_FSETID",
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"CAP_FOWNER",
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"CAP_MKNOD",
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"CAP_NET_RAW",
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"CAP_SETGID",
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"CAP_SETUID",
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"CAP_SETFCAP",
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"CAP_SETPCAP",
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"CAP_NET_BIND_SERVICE",
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"CAP_SYS_CHROOT",
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"CAP_KILL",
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"CAP_AUDIT_WRITE"
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],
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"inheritable": [
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"CAP_CHOWN",
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"CAP_DAC_OVERRIDE",
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"CAP_FSETID",
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"CAP_FOWNER",
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"CAP_MKNOD",
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"CAP_NET_RAW",
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"CAP_SETGID",
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"CAP_SETUID",
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"CAP_SETFCAP",
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"CAP_SETPCAP",
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"CAP_NET_BIND_SERVICE",
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"CAP_SYS_CHROOT",
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"CAP_KILL",
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"CAP_AUDIT_WRITE"
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],
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"permitted": [
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"CAP_CHOWN",
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"CAP_DAC_OVERRIDE",
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"CAP_FSETID",
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"CAP_FOWNER",
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"CAP_MKNOD",
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"CAP_NET_RAW",
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"CAP_SETGID",
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"CAP_SETUID",
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"CAP_SETFCAP",
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"CAP_SETPCAP",
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"CAP_NET_BIND_SERVICE",
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"CAP_SYS_CHROOT",
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"CAP_KILL",
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"CAP_AUDIT_WRITE"
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]
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},
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"rlimits": [
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{
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"type": "RLIMIT_NOFILE",
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"hard": 1024,
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"soft": 1024
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}
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],
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"noNewPrivileges": true
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},
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"root": {
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"path": "rootfs"
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},
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"mounts": [
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{
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"destination": "/proc",
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"type": "proc",
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"source": "proc",
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"options": [
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"nosuid",
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"noexec",
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"nodev"
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]
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},
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{
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"destination": "/dev",
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"type": "tmpfs",
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"source": "tmpfs",
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"options": [
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"nosuid",
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"strictatime",
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"mode=755",
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"size=65536k"
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]
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},
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{
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"destination": "/dev/pts",
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"type": "devpts",
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"source": "devpts",
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"options": [
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"nosuid",
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"noexec",
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"newinstance",
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"ptmxmode=0666",
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"mode=0620",
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"gid=5"
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]
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},
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{
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"destination": "/dev/shm",
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"type": "tmpfs",
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"source": "shm",
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"options": [
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"nosuid",
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"noexec",
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"nodev",
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"mode=1777",
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"size=65536k"
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]
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},
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{
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"destination": "/dev/mqueue",
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"type": "mqueue",
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"source": "mqueue",
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"options": [
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"nosuid",
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"noexec",
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"nodev"
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]
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},
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{
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"destination": "/sys",
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"type": "sysfs",
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"source": "sysfs",
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"options": [
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"nosuid",
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"noexec",
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"nodev",
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"ro"
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]
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},
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{
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"destination": "/run",
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"type": "tmpfs",
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"source": "tmpfs",
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"options": [
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"nosuid",
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"strictatime",
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"mode=755",
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"size=65536k"
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]
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}
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],
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"linux": {
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"resources": {
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"devices": [
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{
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"allow": false,
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"access": "rwm"
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}
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]
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},
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"cgroupsPath": "/default",
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"namespaces": [
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{
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"type": "pid"
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},
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{
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"type": "ipc"
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},
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{
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"type": "uts"
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},
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{
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"type": "mount"
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},
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{
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"type": "network"
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}
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],
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"maskedPaths": [
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"/proc/acpi",
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"/proc/asound",
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"/proc/kcore",
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"/proc/keys",
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"/proc/latency_stats",
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"/proc/timer_list",
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"/proc/timer_stats",
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"/proc/sched_debug",
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"/sys/firmware",
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"/proc/scsi"
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],
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"readonlyPaths": [
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"/proc/bus",
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"/proc/fs",
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"/proc/irq",
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"/proc/sys",
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"/proc/sysrq-trigger"
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]
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}
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}
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@ -84,6 +84,16 @@
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notify: restart containerd
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when: http_proxy is defined or https_proxy is defined
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- name: containerd | Generate default base_runtime_spec
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register: ctr_oci_spec
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command: "{{ containerd_bin_dir }}/ctr oci spec"
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check_mode: false
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changed_when: false
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- name: containerd | Store generated default base_runtime_spec
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set_fact:
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containerd_default_base_runtime_spec: "{{ ctr_oci_spec.stdout | from_json }}"
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- name: containerd | Write base_runtime_specs
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copy:
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content: "{{ item.value }}"
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