src-iSulad
/
0037-add-cgroup-v2-doc.patch

From 2cbce684b973bf4e250f41d750253b5b8abde32d Mon Sep 17 00:00:00 2001
From: zhongtao <[email protected]>
Date: Tue, 20 Feb 2024 19:22:11 +0800
Subject: [PATCH 37/43] add cgroup v2 doc

Signed-off-by: zhongtao <[email protected]>
---
 docs/design/README_zh.md                      |   2 +
 .../detailed/Container/cgroup_v2_design_zh.md | 193 ++++++++++++++++++
 docs/images/cgroup_v2_module.svg              |  16 ++
 3 files changed, 211 insertions(+)
 create mode 100644 docs/design/detailed/Container/cgroup_v2_design_zh.md
 create mode 100644 docs/images/cgroup_v2_module.svg

diff --git a/docs/design/README_zh.md b/docs/design/README_zh.md
index f2c187a1..b7ec3ddb 100644
--- a/docs/design/README_zh.md
+++ b/docs/design/README_zh.md
@@ -18,6 +18,8 @@

 - 查看 restart 模块的设计文档： [restart_manager_design](./detailed/Container/restart_manager_design.md)。

+- 查看 cgroup v2 的设计文档： [cgroup_v2_design](./detailed/Container/cgroup_v2_design_zh.md)。
+
 ## CRI

 - 查看 CRI的启动程序的重构文档： [cri_cni_refactor](./detailed/CRI/cri_cni_refactor_zh.md) 。
diff --git a/docs/design/detailed/Container/cgroup_v2_design_zh.md b/docs/design/detailed/Container/cgroup_v2_design_zh.md
new file mode 100644
index 00000000..e1ce81d0
--- /dev/null
+++ b/docs/design/detailed/Container/cgroup_v2_design_zh.md
@@ -0,0 +1,193 @@
+| Author | zhongtao              |
+| ------ | --------------------- |
+| Date   | 2024-02-19            |
+| Email  | [email protected] |
+# 方案目标
+
+cgroup是linux中用于限制进程组资源的功能。cgroup目前包括两个版本，cgroup v1和cgroup v2。cgroup v2的目标是取代cgroup v1，出于兼容性的考虑，cgroup v1并没有在内核中删除，并且大概率会长期存在。该需求的目的为使得iSulad支持cgroup v2.
+
+## 与cgroup v1差异
+无论是cgroup v1还是cgroup v2，iSulad提供给用户使用的接口都是一致的。不过由于有部分cgroup v1支持的功能在cgroup v2中被去掉了或者实现方式有所变化，因此部分接口在cgroup v2中不可用或者含义发生变化。iSulad支持限制如下资源：
+
+|资源|功能|和cgroup v1的差异|
+|---|---|---|
+|devices|限制对应的设备是否可以在容器中访问以及访问权限|devcies子系统不再使用往cgroup文件里写值的方式进行限制，而是采用ebpf的方式进行限制|
+|memory|限制容器的内存资源|不支持swappiness，不支持kmem相关参数，不支持oom_control|
+|cpu/cpuset|限制容器的cpu资源|不支持rt_*相关(实时线程)的限制|
+|blkio/io|限制容器的块设备io|不仅限制块设备的IO，也能限制buffer IO|
+|hugetlb|限制大页内存的使用|无差异|
+|pids|限制容器使用的pid|无差异|
+|files|限制容器使用的fd|无差异|
+|freeze|暂停容器|无差异|
+
+## 使用方式
+
+使用的示例如下：
+
+1. 以限制内存资源为例，假设我们需要限制单个容器最多使用10M内存，则可以在运行容器时加上-m 10m参数进行限制：
+
+    ```sh
+    [root@openEuler iSulad]# isula run -tid -m 10m busybox sh
+    000c0c6eb609179062b19a3d2de4d7c38a42c887f55e2a7759ed9df851277163
+    ```
+
+    -m 10m表示限制容器内最多只能使用10m内存，可以通过isula stats命令查看资源的限制情况：
+
+    ```sh
+    [root@openEuler iSulad]# isula stats --no-stream 000c0c6eb6
+    CONTAINER CPU % MEM USAGE / LIMIT MEM % BLOCK I / O PIDS
+    000c0c6eb609 0.00 104.00 KiB / 10.00 MiB 1.02 0.00 B / 0.00 B 1
+    ```
+
+    可以动态更新资源的限制：
+    ```sh
+    [root@openEuler iSulad]# isula update -m 20m 000c0c6eb6
+    000c0c6eb6
+    [root@openEuler iSulad]# isula stats --no-stream 000c0c6eb6
+    CONTAINER CPU % MEM USAGE / LIMIT MEM % BLOCK I / O PIDS
+    000c0c6eb609 0.00 104.00 KiB / 20.00 MiB 0.51 0.00 B / 0.00 B 1
+    ```
+
+2. 假设我们要将设备/dev/sda挂载到容器中成为/dev/sdx并限制为只读设备，则可以这么配置：
+
+```sh
+    [root@openEuler iSulad]# isula run -ti --rm --device=/dev/sda:/dev/sdx:wm busybox fdisk /dev/sdx
+    fdisk: can't open '/dev/sdx'
+    [root@openEuler iSulad]#
+```
+
+挂载设备到容器的语法为`--device=$host:$container:rwm $host`指定设备在主机上的绝对路径，$container指定设备在容器内的绝对路径，r表示可读，w表示可写，m表示可以创建node 上述命令中rwm三个参数缺少r参数，也就是说允许写和创建node但是不允许读(即只读)。
+
+3. 使用cri的PodSandboxStats接口与ContainerStats接口获取容器的资源使用状况：
+
+```sh
+[root@openEuler ~]# crictl statsp c3
+    POD POD ID CPU % MEM
+    test-sandbox c32556d3bb139 0.00 196.6kB
+[root@openEuler ~]# crictl statsp --output json c3
+......
+      "linux": {
+        "cpu": {
+          "timestamp": "1708499622485777700",
+          "usageCoreNanoSeconds": {
+            "value": "180973"
+          },
+          "usageNanoCores": null
+        },
+        "memory": {
+          "timestamp": "1708499622485777700",
+          "workingSetBytes": {
+            "value": "196608"
+          },
+          "availableBytes": {
+            "value": "0"
+          },
+          "usageBytes": {
+            "value": "4386816"
+          },
+          "rssBytes": {
+            "value": "176128"
+          },
+          "pageFaults": {
+            "value": "1193"
+          },
+          "majorPageFaults": {
+            "value": "6"
+          }
+        },
+        "network": null,
+        "process": {
+          "timestamp": "1708499622485777700",
+          "processCount": {
+            "value": "2"
+          }
+        },
+.....
+
+[root@openEuler ~]# crictl stats 01
+CONTAINER CPU % MEM DISK INODES
+01a726f61c5c3 0.01 3.801MB 16.4kB 8
+[root@openEuler ~]#
+```
+
+# 总体设计
+
+在原有只支持cgroup v1的基础上，对cgroup模块进行了重构，重构后的架构图如下：
+
+![cgroup_v2_module](../../../images/cgroup_v2_module.svg)
+
+主要功能为以下两种：
+
+1. iSulad在资源控制参数设置和更新过程中，负责参数的合法校验，用于拦截非法请求，真正的cgroup操作由容器运行时完成。
+
+2. iSulad在获得sandbox资源使用信息时，直接读取sandbox cgroup文件信息。
+
+# 接口描述
+由于无论是cgroup v1还是cgroup v2，iSulad提供给用户使用的接口都是一致的。
+无新增接口。
+
+```c
+int verify_container_settings(const oci_runtime_spec *container, const sysinfo_t *sysinfo);
+
+int verify_host_config_settings(host_config *hostconfig, const sysinfo_t *sysinfo, bool update);
+
+
+typedef struct {
+    int (*get_cgroup_info)(cgroup_mem_info_t *meminfo, cgroup_cpu_info_t *cpuinfo,
+                            cgroup_hugetlb_info_t *hugetlbinfo, cgroup_blkio_info_t *blkioinfo,
+                            cgroup_cpuset_info_t *cpusetinfo, cgroup_pids_info_t *pidsinfo,
+                            cgroup_files_info_t *filesinfo, bool quiet);
+    int (*get_cgroup_metrics)(const char *cgroup_path, cgroup_metrics_t *cgroup_metrics);
+
+    int (*common_find_cgroup_mnt_and_root)(const char *subsystem, char **mountpoint, char **root);
+
+    char *(*sysinfo_cgroup_controller_cpurt_mnt_path)(void);
+} cgroup_ops;
+
+int cgroup_v2_ops_init(cgroup_ops *ops)
+{
+    if (ops == NULL) {
+        return -1;
+    }
+    ops->get_cgroup_info = common_get_cgroup_info_v2;
+    ops->get_cgroup_metrics = common_get_cgroup_v2_metrics;
+    ops->common_find_cgroup_mnt_and_root = common_find_cgroup_v2_mnt_and_root;
+    return 0;
+}
+```
+
+# 详细设计
+
+```mermaid
+sequenceDiagram
+  participant isula
+  participant kubelet
+  participant isulad
+  participant runc
+  participant cgroup
+
+  isula->>isulad: request
+  kubelet->>isulad:request
+  alt run/create/update
+	isulad->>isulad:verify request option
+  	isulad->>runc:run/create/update request
+  	runc ->> cgroup:write cgroup file
+  else stats
+    par container stats
+	isulad->>runc:container stats request
+  	runc ->> cgroup:read cgroup file
+  	runc ->> isulad:container stats info
+  	and sandbox stats
+  	isulad ->> cgroup: read cgroup file
+  	end
+  end
+	isulad ->> isula:response
+	isulad ->> kubelet:response
+```
+
+# 使用限制
+
+1. 只支持cgroup 挂载点在/sys/fs/cgroup
+2. cgroup v1与cgrooup v2混用场景不支持
+3. 该需求只涉及cgroup v2对runc容器运行时的支持
+
diff --git a/docs/images/cgroup_v2_module.svg b/docs/images/cgroup_v2_module.svg
new file mode 100644
index 00000000..59e7939b
--- /dev/null
+++ b/docs/images/cgroup_v2_module.svg
@@ -0,0 +1,16 @@
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+  <!-- svg-source:excalidraw -->
+
+  <defs>
+    <style class="style-fonts">
+      @font-face {
+        font-family: "Virgil";
+        src: url("https://excalidraw.com/Virgil.woff2");
+      }
+      @font-face {
+        font-family: "Cascadia";
+        src: url("https://excalidraw.com/Cascadia.woff2");
+      }
+    </style>
+  </defs>
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2.34.1