podman 容器一直stopping

本文记录了在mac搭建的istio环境在创建了4个带有istio-proxy的pod后，无法再新建pod的问题，提示 FailedScheduling 0/1 nodes are available: 1 Insufficient cpu. preemption: 0/1 nodes are available: 1 No preemption victims found for incoming pod.，开始查找分析原因，最终找到解决方案。

一、问题背景

创建的pod一直在pending状态

使用 kubectl describe po 查看下原因

kubectl describe po istio-springboot-demo-b-v1-7cf6979bbd-ct8kr -n istio-demos

输出的原因部分如下：

Events:
  Type     Reason            Age   From               Message
  ----     ------            ----  ----               -------
  Warning  FailedScheduling  3m    default-scheduler  0/1 nodes are available: 1 Insufficient cpu. preemption: 0/1 nodes are available: 1 No preemption victims found for incoming pod.

从Message看，很明显是cpu不够不了，无法调度。为什么会这样呢？
通过下面的步骤查看下node的信息
先查看node

saleson@SalesondeMacBook-Pro demo-b % kubectl get nodes
NAME             STATUS   ROLES           AGE   VERSION
docker-desktop   Ready    control-plane   21d   v1.24.1

再通过下面的命令的查看po使用cpu和内在的情况

kubectl describe node docker-desktop

Capacity:
  cpu:                2
  ephemeral-storage:  61255492Ki
  hugepages-1Gi:      0
  hugepages-2Mi:      0
  memory:             8049416Ki
  pods:               110
Allocatable:
  cpu:                2
  ephemeral-storage:  56453061334
  hugepages-1Gi:      0
  hugepages-2Mi:      0
  memory:             7947016Ki
  pods:               110
System Info:
  Machine ID:                 7679dc44-ba20-41de-afe7-6131f6cdfb01
  System UUID:                25cc4672-0000-0000-aaf7-f9f722a48b3c
  Boot ID:                    72f1a678-b1e3-435a-a235-409592f5bf2b
  Kernel Version:             5.10.104-linuxkit
  OS Image:                   Docker Desktop
  Operating System:           linux
  Architecture:               amd64
  Container Runtime Version:  docker://20.10.17
  Kubelet Version:            v1.24.1
  Kube-Proxy Version:         v1.24.1
Non-terminated Pods:          (20 in total)
  Namespace                   Name                                               CPU Requests  CPU Limits  Memory Requests  Memory Limits  Age
  ---------                   ----                                               ------------  ----------  ---------------  -------------  ---
  istio-demos                 demo-istio-h5-latest-848b989c99-7rbv7              100m (5%)     2 (100%)    128Mi (1%)       1Gi (13%)      6m34s
  istio-demos                 demo-istio-h5-v1-7fc5575845-5r28k                  100m (5%)     2 (100%)    128Mi (1%)       1Gi (13%)      6m34s
  istio-demos                 istio-springboot-demo-a-latest-64d5cf969f-6r7pf    100m (5%)     2 (100%)    128Mi (1%)       1Gi (13%)      6m22s
  istio-demos                 istio-springboot-demo-a-v1-7d64cc6578-n6rs7        100m (5%)     2 (100%)    128Mi (1%)       1Gi (13%)      6m22s
  istio-system                grafana-6787c6fb46-jklbh                           0 (0%)        0 (0%)      0 (0%)           0 (0%)         6d13h
  istio-system                istio-egressgateway-679565ff87-g8lq7               100m (5%)     2 (100%)    128Mi (1%)       1Gi (13%)      6d14h
  istio-system                istio-ingressgateway-b67d7948d-wfxgb               100m (5%)     2 (100%)    128Mi (1%)       1Gi (13%)      6d14h
  istio-system                istiod-645c8d8598-qmslz                            500m (25%)    0 (0%)      2Gi (26%)        0 (0%)         6d14h
  istio-system                jaeger-5b994f64f4-gvcqt                            10m (0%)      0 (0%)      0 (0%)           0 (0%)         6d13h
  istio-system                kiali-565bff499-bfrhr                              0 (0%)        0 (0%)      0 (0%)           0 (0%)         6d13h
  istio-system                prometheus-74cd54db7f-flppp                        0 (0%)        0 (0%)      0 (0%)           0 (0%)         6d13h
  kube-system                 coredns-6d4b75cb6d-5rqbc                           100m (5%)     0 (0%)      70Mi (0%)        170Mi (2%)     21d
  kube-system                 coredns-6d4b75cb6d-wdh6b                           100m (5%)     0 (0%)      70Mi (0%)        170Mi (2%)     6d14h
  kube-system                 etcd-docker-desktop                                100m (5%)     0 (0%)      100Mi (1%)       0 (0%)         21d
  kube-system                 kube-apiserver-docker-desktop                      250m (12%)    0 (0%)      0 (0%)           0 (0%)         21d
  kube-system                 kube-controller-manager-docker-desktop             200m (10%)    0 (0%)      0 (0%)           0 (0%)         21d
  kube-system                 kube-proxy-tnb9q                                   0 (0%)        0 (0%)      0 (0%)           0 (0%)         21d
  kube-system                 kube-scheduler-docker-desktop                      100m (5%)     0 (0%)      0 (0%)           0 (0%)         21d
  kube-system                 storage-provisioner                                0 (0%)        0 (0%)      0 (0%)           0 (0%)         21d
  kube-system                 vpnkit-controller                                  0 (0%)        0 (0%)      0 (0%)           0 (0%)         21d
Allocated resources:
  (Total limits may be over 100 percent, i.e., overcommitted.)
  Resource           Requests      Limits
  --------           --------      ------
  cpu                1960m (98%)   12 (600%)
  memory             3056Mi (39%)  6484Mi (83%)
  ephemeral-storage  0 (0%)        0 (0%)
  hugepages-1Gi      0 (0%)        0 (0%)
  hugepages-2Mi      0 (0%)        0 (0%)
Events:              <none>

可以看到几个用于istio测试的demo的pod都有使用配额，从其中挑选一个pod进行查看

kubectl describe po istio-springboot-demo-a-latest-64d5cf969f-6r7pf -n istio-demos

找到了使用配额的容器，原来是istio的代理容器(sidecar) : istio-proxy

二、调整istio关于sidecar的资源配额参数

查找参数配置

后来在istio安装包找到关于proxy相关的资源配额参数，文件路径：istio-1.12.9/manifests/charts/istio-control/istio-discovery/values.yaml

resources相关参数：

动态调整

然后找到了参数所在的文件对于已经在运行的istio环境也无能为力，因为改文件中的参数并不能应用于正在运行的istio环境中，后面找了好久，终于找到一篇华为的文章： 如何调整istio-proxy容器resources requests取值？

这里记录一下

方法一：调整网格中的所有服务

调整后，对已经创建的istio-proxy并不会做改动，但是之后创建的istio-proxy将会使用调整后的参数。

1. 执行以下命令修改comfigmap

kubectl edit cm istio-sidecar-injector -n istio-system

可以调整配额大小，也可以删除掉。

本文的实验中，是将之删除掉了。

2. 重启istio-system命名空间下的istio-sidecar-injector Pod。
   本文中的实验并没有按上述文章中的步骤重启istio-system命名空间下的istio-sidecar-injector，但之后创建的istio-proxy仍是使用调整后的参数。
   也是由于是实验关系，在使用环境建议还是按上述文章中的步骤重启。
3. 重启业务服务Pod，多实例滚动升级不会断服。

方法二：调整网格中的某个服务

1. 修改服务的yaml文件
   命令格式：

kubectl edit deploy <nginx> -n <namespace>

本次实验在namespace istio-demos进行，查看namespace下的deployment

kubectl get deploy -n istio-demos

输出如下：

saleson@SalesondeMacBook-Pro istio-discovery % kubectl get deploy -n istio-demos
NAME                             READY   UP-TO-DATE   AVAILABLE   AGE
demo-istio-h5-latest             1/1     1            1           3h59m
demo-istio-h5-v1                 1/1     1            1           3h59m
istio-springboot-demo-a-latest   1/1     1            1           3h58m
istio-springboot-demo-a-v1       1/1     1            1           3h58m
istio-springboot-demo-b-latest   1/1     1            1           27m
istio-springboot-demo-b-v1       1/1     1            1           27m

使用下命令进入istio-springboot-demo-b-v1的编辑面板：

kubectl edit deploy istio-springboot-demo-b-v1 -n istio-demos

1. 在spec.template.metadata.annotations下添加如下配置（大小仅供参考，请自行替换）

sidecar.istio.io/proxyCPU: 100m
    sidecar.istio.io/proxyCPULimit: 100m
    sidecar.istio.io/proxyMemory: 500Mi
    sidecar.istio.io/proxyMemoryLimit: 500Mi

编辑保存后的结果如下：

1. 修改后服务滚动升级，确保不会断服
   执行如下命令重启deployment

kubectl rollout restart deployment istio-springboot-demo-b-v1 -n istio-demos

1. 查看修改后的结果
   使用下面的命令查看修改后的配额

kubectl describe node docker-desktop

三、提前规划

先调整istio-1.12.9/manifests/charts/istio-control/istio-discovery/values.yaml中关于proxy的配额，再安装istio-discovery

参考

如何调整istio-proxy容器resources requests取值？Pod滚动重启方法 - 运维笔记