我正在尝试使用Helm v2执行Kubernetes 滚动更新；但是，我做不到。
当我helm upgrade对慢速 Tomcat 映像执行 a 时，原始 pod 被破坏。
我想弄清楚如何通过使用新实例增量更新 Pods 实例并耗尽旧实例来实现零停机时间。
为了演示，我创建了一个示例慢速 Tomcat Docker 映像和一个Helm 图表。
安装：
helm install https://github.com/h-q/slowtom/raw/master/docs/slowtom.tgz --name slowtom \
-f https://github.com/h-q/slowtom/raw/master/docs/slowtom/environments/initial.yaml
您可以通过运行来跟踪日志kubectl logs -f slowtom-sf-0，一旦准备好您就可以访问应用程序http://localhost:30901
升级：
（这就是我需要帮助的地方）
helm upgrade slowtom https://github.com/h-q/slowtom/raw/master/docs/slowtom.tgz \
-f https://github.com/h-q/slowtom/raw/master/docs/slowtom/environments/upgrade.yaml
除了标签版本号之外，它与部署文件upgrade.yaml相同。initial.yaml
在这里，原来的 pod 被破坏了，新的 pod 开始了。同时，用户无法访问应用程序http://localhost:30901
删除：
helm del slowtom --purge
参考
本地头盔图
下载舵图：
curl -LO https://github.com/h-q/slowtom/raw/master/docs/slowtom.tgz
tar vxfz ./slowtom.tgz
从本地 helm-chart 安装：
helm install --debug ./slowtom --name slowtom -f ./slowtom/environments/initial.yaml
从本地 helm-chart 升级：
helm upgrade --debug slowtom ./slowtom -f ./slowtom/environments/upgrade.yaml
码头工人形象
Dockerfile
FROM tomcat:8.5-jdk8-corretto
RUN mkdir /usr/local/tomcat/webapps/ROOT && \
echo '<html><head><title>Slow Tomcat</title></head><body><h1>Slow Tomcat Now Ready</h1></body></html>' >> /usr/local/tomcat/webapps/ROOT/index.html
RUN echo '#!/usr/bin/env bash' >> /usr/local/tomcat/bin/slowcatalina.sh && \
echo 'x=2' >> /usr/local/tomcat/bin/slowcatalina.sh && \
echo 'secs=$(($x * 60))' >> /usr/local/tomcat/bin/slowcatalina.sh && \
echo 'while [ $secs -gt 0 ]; do' >> /usr/local/tomcat/bin/slowcatalina.sh && \
echo ' >&2 echo -e "Blast off in $secs\033[0K\r"' >> /usr/local/tomcat/bin/slowcatalina.sh && \
echo ' sleep 1' >> /usr/local/tomcat/bin/slowcatalina.sh && \
echo ' : $((secs--))' >> /usr/local/tomcat/bin/slowcatalina.sh && \
echo 'done' >> /usr/local/tomcat/bin/slowcatalina.sh && \
echo '>&2 echo "slow cataline done. will now start real catalina"' >> /usr/local/tomcat/bin/slowcatalina.sh && \
echo 'exec catalina.sh run' >> /usr/local/tomcat/bin/slowcatalina.sh && \
chmod +x /usr/local/tomcat/bin/slowcatalina.sh
ENTRYPOINT ["/usr/local/tomcat/bin/slowcatalina.sh"]
Helm 图表内容
slowtom/Chart.yaml
apiVersion: v1
description: slow-tomcat Helm chart for Kubernetes
name: slowtom
version: 1.1.2 # whatever
slowtom/values.yaml
# Do not use this file, but ones from environmments folder
slowtom/environments/initial.yaml
# Storefront
slowtom_sf:
name: "slowtom-sf"
hasHealthcheck: "true"
isResilient: "false"
replicaCount: 2
aspect_values:
- name: y_aspect
value: "storefront"
image:
repository: hqasem/slow-tomcat
pullPolicy: IfNotPresent
tag: 1
env:
- name: y_env
value: whatever
slowtom/environments/upgrade.yaml
# Storefront
slowtom_sf:
name: "slowtom-sf"
hasHealthcheck: "true"
isResilient: "false"
replicaCount: 2
aspect_values:
- name: y_aspect
value: "storefront"
image:
repository: hqasem/slow-tomcat
pullPolicy: IfNotPresent
tag: 2
env:
- name: y_env
value: whatever
slowtom/templates/deployment.yaml
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: {{ .Values.slowtom_sf.name }}
labels:
chart: "{{ .Chart.Name | trunc 63 }}"
chartVersion: "{{ .Chart.Version | trunc 63 }}"
visualize: "true"
app: {{ .Values.slowtom_sf.name }}
spec:
replicas: {{ .Values.slowtom_sf.replicaCount }}
selector:
matchLabels:
app: {{ .Values.slowtom_sf.name }}
template:
metadata:
labels:
app: {{ .Values.slowtom_sf.name }}
visualize: "true"
spec:
dnsPolicy: ClusterFirstWithHostNet
containers:
- name: {{ .Values.slowtom_sf.name }}
image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
imagePullPolicy: {{ .Values.image.pullPolicy }}
command: ["/usr/local/tomcat/bin/slowcatalina.sh"]
args: ["whatever"]
env:
{{ toYaml .Values.env | indent 12 }}
{{ toYaml .Values.slowtom_sf.aspect_values | indent 12 }}
resources:
{{ toYaml .Values.resources | indent 12 }}
---
slowtom/templates/service.yaml
kind: Service
apiVersion: v1
metadata:
name: {{.Values.slowtom_sf.name}}
labels:
chart: "{{ .Chart.Name | trunc 63 }}"
chartVersion: "{{ .Chart.Version | trunc 63 }}"
app: {{.Values.slowtom_sf.name}}
visualize: "true"
hasHealthcheck: "{{ .Values.slowtom_sf.hasHealthcheck }}"
isResilient: "{{ .Values.slowtom_sf.isResilient }}"
spec:
type: NodePort
selector:
app: {{.Values.slowtom_sf.name}}
sessionAffinity: ClientIP
ports:
- protocol: TCP
port: 8080
targetPort: 8080
name: http
nodePort: 30901
---