# CKS D3C1 Container Sandbox
###### tags: `CKS Day3`
## Install gVisor
参考链接:[gVisor Install](https://gvisor.dev/docs/user_guide/install/)
## Install from an apt repository
First, appropriate dependencies must be installed to allow apt to install packages via https:
```
sudo apt-get update && \
sudo apt-get install -y \
apt-transport-https \
ca-certificates \
curl \
gnupg-agent \
software-properties-common
```
Next, the configure the key used to sign archives and the repository:
```
curl -fsSL https://gvisor.dev/archive.key | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64,arm64] https://storage.googleapis.com/gvisor/releases release main"
```
Now the runsc package can be installed:
```
sudo apt-get update && sudo apt-get install -y runsc
```
If you have Docker installed, it will be automatically configured.
## 注意事项
Requirements
* runsc and containerd-shim-runsc-v1: See the installation guide.
* containerd: See the containerd website for information on how to install containerd. Minimal *version supported: 1.3.9 or 1.4.3.
下载的新版本的Containerd, 将二进制解压到/usr/bin/下. 完成Containerd的更新, 重启Containerd,Kubelet.
## 修改或替换Containerd配置文件
配置文件位置: /etc/containerd/config.toml
sandbox_image = "", 选择版本支持的pause image.
```
root = "/var/lib/containerd"
state = "/run/containerd"
oom_score = 0
[grpc]
address = "/run/containerd/containerd.sock"
uid = 0
gid = 0
max_recv_message_size = 16777216
max_send_message_size = 16777216
[debug]
address = ""
uid = 0
gid = 0
level = ""
[metrics]
address = ""
grpc_histogram = false
[cgroup]
path = ""
[plugins]
[plugins.cgroups]
no_prometheus = false
[plugins.cri]
stream_server_address = "127.0.0.1"
stream_server_port = "0"
enable_selinux = false
sandbox_image = "k8s.gcr.io/pause:3.2"
stats_collect_period = 10
systemd_cgroup = false
enable_tls_streaming = false
max_container_log_line_size = 16384
[plugins.cri.containerd]
snapshotter = "overlayfs"
no_pivot = false
[plugins.cri.containerd.default_runtime]
runtime_type = "io.containerd.runtime.v1.linux"
runtime_engine = ""
runtime_root = ""
[plugins.cri.containerd.untrusted_workload_runtime]
runtime_type = ""
runtime_engine = ""
runtime_root = ""
[plugins.cri.containerd.runtimes.runsc]
runtime_type = "io.containerd.runsc.v1"
[plugins.cri.cni]
bin_dir = "/opt/cni/bin"
conf_dir = "/etc/cni/net.d"
conf_template = ""
[plugins.cri.registry]
[plugins.cri.registry.mirrors]
[plugins.cri.registry.mirrors."docker.io"]
endpoint = ["https://registry-1.docker.io"]
[plugins.cri.x509_key_pair_streaming]
tls_cert_file = ""
tls_key_file = ""
[plugins.diff-service]
default = ["walking"]
[plugins.linux]
shim = "containerd-shim"
runtime = "runc"
runtime_root = ""
no_shim = false
shim_debug = false
[plugins.opt]
path = "/opt/containerd"
[plugins.restart]
interval = "10s"
[plugins.scheduler]
pause_threshold = 0.02
deletion_threshold = 0
mutation_threshold = 100
schedule_delay = "0s"
startup_delay = "100ms"
```
---
## 测试
创建RuntimeClass
```
apiVersion: node.k8s.io/v1beta1
kind: RuntimeClass
metadata:
name: gvisor
handler: runsc
```
创建Pod, 调用RuntimeClass. 记得选择runsc所在的节点.
```
apiVersion: v1
kind: Pod
metadata:
name: nettool-gvisor
spec:
nodeName: ubuk8s-vm03
runtimeClassName: gvisor
containers:
- name: nettool
image: rock981119/net-tools:v2
```
验证:
```
kubectl exec -it nettool-gvisor bash
root@nettool-gvisor:/# uname -a
Linux nettool-gvisor 4.4.0 #1 SMP Sun Jan 10 15:06:54 PST 2016 x86_64 x86_64 x86_64 GNU/Linux
root@nettool-gvisor:/# dmesg
[ 0.000000] Starting gVisor...
[ 0.123974] Segmenting fault lines...
[ 0.476738] Singleplexing /dev/ptmx...
[ 0.967389] Constructing home...
[ 1.107386] Reading process obituaries...
[ 1.500969] Creating cloned children...
[ 1.987875] Creating bureaucratic processes...
[ 2.115372] Searching for needles in stacks...
[ 2.454154] Feeding the init monster...
[ 2.856546] Mounting deweydecimalfs...
[ 3.183163] Synthesizing system calls...
[ 3.369550] Ready!
```
如果是使用containerd config default > /etc/containerd/config.toml 生成的配置文件, 可以按照下方进行更改, 配置中还加入了私有镜像仓库.
```
version = 2
root = "/var/lib/containerd"
state = "/run/containerd"
plugin_dir = ""
disabled_plugins = []
required_plugins = []
oom_score = 0
[grpc]
address = "/run/containerd/containerd.sock"
tcp_address = ""
tcp_tls_cert = ""
tcp_tls_key = ""
uid = 0
gid = 0
max_recv_message_size = 16777216
max_send_message_size = 16777216
[ttrpc]
address = ""
uid = 0
gid = 0
[debug]
address = ""
uid = 0
gid = 0
level = ""
[metrics]
address = ""
grpc_histogram = false
[cgroup]
path = ""
[timeouts]
"io.containerd.timeout.shim.cleanup" = "5s"
"io.containerd.timeout.shim.load" = "5s"
"io.containerd.timeout.shim.shutdown" = "3s"
"io.containerd.timeout.task.state" = "2s"
[plugins]
[plugins."io.containerd.gc.v1.scheduler"]
pause_threshold = 0.02
deletion_threshold = 0
mutation_threshold = 100
schedule_delay = "0s"
startup_delay = "100ms"
[plugins."io.containerd.grpc.v1.cri"]
disable_tcp_service = true
stream_server_address = "127.0.0.1"
stream_server_port = "0"
stream_idle_timeout = "4h0m0s"
enable_selinux = false
sandbox_image = "k8s.gcr.io/pause:3.2"
stats_collect_period = 10
systemd_cgroup = false
enable_tls_streaming = false
max_container_log_line_size = 16384
disable_cgroup = false
disable_apparmor = false
restrict_oom_score_adj = false
max_concurrent_downloads = 3
disable_proc_mount = false
[plugins."io.containerd.grpc.v1.cri".containerd]
snapshotter = "overlayfs"
default_runtime_name = "runc"
no_pivot = false
[plugins."io.containerd.grpc.v1.cri".containerd.default_runtime]
runtime_type = ""
runtime_engine = ""
runtime_root = ""
privileged_without_host_devices = false
[plugins."io.containerd.grpc.v1.cri".containerd.untrusted_workload_runtime]
runtime_type = ""
runtime_engine = ""
runtime_root = ""
privileged_without_host_devices = false
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes]
[plugins.io.containerd.grpc.v1.cri".containerd.runtimes.runsc]
runtime_type = "io.containerd.runsc.v1"
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
runtime_type = "io.containerd.runc.v1"
runtime_engine = ""
runtime_root = ""
privileged_without_host_devices = false
[plugins."io.containerd.grpc.v1.cri".cni]
bin_dir = "/opt/cni/bin"
conf_dir = "/etc/cni/net.d"
max_conf_num = 1
conf_template = ""
[plugins."io.containerd.grpc.v1.cri".registry]
[plugins."io.containerd.grpc.v1.cri".registry.mirrors]
[plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]
endpoint = ["https://registry-1.docker.io"]
[plugins."io.containerd.grpc.v1.cri".registry.mirrors."192.168.31.250:5000"]
endpoint = ["https://192.168.31.250:5000"]
[plugins."io.containerd.grpc.v1.cri".registry.configs]
[plugins."io.containerd.grpc.v1.cri".registry.configs."192.168.31.250:5000".tls]
insecure_skip_verify = true
[plugins."io.containerd.grpc.v1.cri".x509_key_pair_streaming]
tls_cert_file = ""
tls_key_file = ""
[plugins."io.containerd.internal.v1.opt"]
path = "/opt/containerd"
[plugins."io.containerd.internal.v1.restart"]
interval = "10s"
[plugins."io.containerd.metadata.v1.bolt"]
content_sharing_policy = "shared"
[plugins."io.containerd.monitor.v1.cgroups"]
no_prometheus = false
[plugins."io.containerd.runtime.v1.linux"]
shim = "containerd-shim"
runtime = "runc"
runtime_root = ""
no_shim = false
shim_debug = false
[plugins."io.containerd.runtime.v2.task"]
platforms = ["linux/amd64"]
[plugins."io.containerd.service.v1.diff-service"]
default = ["walking"]
[plugins."io.containerd.snapshotter.v1.devmapper"]
root_path = ""
pool_name = ""
base_image_size = ""
```
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