图片来自：https://getboulder.com/boulder-artist-rocks-the-world/ 引 话说，在很长一段时间

小众 iSCSI 简介

前言 学习 Kubernetes 就像玩动作游戏，当我高高兴兴地打败了一关的 BOSS 后总以为是大结局了，谁知道后面还有更大的BOSS 出现。 当我以为学习完容器化、Linux

由来 时间回到 2017 年，老东家要上 Kubernetes 了，有幸参与和学习（主要是学习）。当时遇到的一了所有 Java 容器化者都遇到的坑：JDK8 不为容器化设计综合症。最简单

为何要调优 如果说，引入一个技术需要兴趣和冲劲，那么，让这个技术上线需要的是坚持和执着。 Cloud Native 如是， Istio 如是。 在上线前的性能测试中，Istio 的使

前言 话说，一年前项目响应时代的号召，引入了 Istio，从此如刘备得卧龙、凤雏，走上了 Service Mesh 的光辉大道。现到准备益州之战(上线)之时。上线前，还

CPU Benchmark The SysBench system benchmark suite has a simple CPU benchmark tool that calculates prime numbers. For example: # sysbench --num-threads=8 --test=cpu --cpu-max-prime=100000 run sysbench 0.4.12: multi-threaded system evaluation benchmark Running the test with following options: Number of threads: 8 Doing CPU performance benchmark Threads started! Done. Maximum prime number checked in CPU test: 100000 Test execution summary: total time: 30.4125s total number of events: 10000 total time taken by event execution: 243.

Jobs SIGHUP 默认动作：Terminate 可能动作：Terminate, Ignore, Function call 当检测到 hangup 时，UART 驱动会向整个 session 发送 SIGHUP 信号。 正常情况下，这会 kill 掉所有

k6 https://github.com/k6io/k6 Locust https://docs.locust.io/en/stable/what-is-locust.html gatling https://gatling.io/docs/current/http/http_request/ artillery https://artillery.io/docs/guides/overview/welcome.html wrk https://github.com/wg/wrk

Tables↓/Chains→ PREROUTING INPUT FORWARD OUTPUT POSTROUTING (routing decision) ✓ raw ✓ ✓ (connection tracking enabled) ✓ ✓ mangle ✓ ✓ ✓ ✓ ✓ nat (DNAT) ✓ ✓ (routing decision) ✓ ✓ filter ✓ ✓ ✓ security ✓ ✓ ✓ nat (SNAT) ✓ ✓ Incoming packets destined for the local system: PREROUTING -> INPUT Incoming packets destined to another host: PREROUTING -> FORWARD -> POSTROUTING Locally generated packets: OUTPUT -> POSTROUTING Connection Tracking https://arthurchiao.

内置 Classloader Bootstrap Class Loader Java classes are loaded by an instance of java.lang.ClassLoader. However, class loaders are classes themselves. Hence, the question is, who loads the java.lang.ClassLoader itself*?* This is where the bootstrap or primordial class loader comes into the picture. It’s mainly responsible for loading JDK internal classes, typically rt.jar and other core libraries located in $JAVA_HOME/jre/lib directory. Additionally, Bootstrap class loader serves as a parent of

https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/docs/contributing/javaagent-jar-components.md Conf Creating spans around methods with otel.instrumentation.methods.include Ref: https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/docs/manual-instrumentation.md Format is "java -Dotel.instrumentation.methods.include=my.package.MyClass1[method1,method2];my.package.MyClass2[method3]" Classloader [arthas@16908]$ classloader -t +-BootstrapClassLoader +-io.opentelemetry.javaagent.bootstrap.AgentClassLoader@379619aa +-sun.misc.Launcher$ExtClassLoader@41fa769c +-com.taobao.arthas.agent.ArthasClassloader@3697b340 +-sun.misc.Launcher$AppClassLoader@18b4aac2 +-java.net.URLClassLoader@71b2d611 +-java.net.URLClassLoader@69cd1085 | +-WebAppClassLoader=266661735@fe4ef67 | | +-com.mycom.sig.foundation.servicediscovery.ExtendedClassLoader@573f7aae | +-WebAppClassLoader=Server Initiated@1ccb04b3 | | +-com.mycom.sig.foundation.servicediscovery.ExtendedClassLoader@4b3b9a06 | | +-jnr.ffi.provider.jffi.AsmClassLoader@73cb9ccb | | +-jnr.ffi.provider.jffi.AsmClassLoader@7c380e94 | | +-jnr.ffi.provider.jffi.AsmClassLoader@69ec5d1f | +-WebAppClassLoader=OAuth Server@10d98940 | | +-com.mycom.ece.common.svcfinder.ExtendedClassLoader@3528968e | | +-com.mycom.sig.foundation.servicediscovery.ExtendedClassLoader@2919aff3 | | +-jnr.ffi.provider.jffi.AsmClassLoader@1b0e6bac | | +-jnr.ffi.provider.jffi.AsmClassLoader@2f12d8d1 | | +-jnr.ffi.provider.jffi.AsmClassLoader@73123f21 | +-WebAppClassLoader=1133988396@43974a2c | +-com.mycom.sig.foundation.servicediscovery.ExtendedClassLoader@39d87c5f +-java.net.URLClassLoader@1b4c457c +-java.net.URLClassLoader@3a477cf5 Affect(row-cnt:24)

Custom Resource 的入口 请求是这样分发到 api 扩展点的： 例如我们有 （Custom Resource）CR 1 2 3 4 5 6 7 8 apiVersion:cnat.programming-kubernetes.info/v1alpha1kind:Atmetadata:name:example-atspec:schedule:"2019-07-03T02:00:00Z"status:phase:"pending" 相应的 CustomResourceDefinition (CRD) 会是这样： 1 2 3 4 5 6 7 8 9