排错工具
本章主要介绍在 Kubernetes 排错中常用的工具。
kubectl：用于查看 Kubernetes 集群以及容器的状态，如kubectl describe pod <pod-name>journalctl：用于查看 Kubernetes 组件日志，如journalctl -u kubelet -liptables和ebtables：用于排查 Service 是否工作，如iptables -t nat -nL查看 kube-proxy 配置的 iptables 规则是否正常tcpdump：用于排查容器网络问题，如tcpdump -nn host 10.240.0.8perf：Linux 内核自带的性能分析工具，常用来排查性能问题，如 Container Isolation Gone Wrong 问题的排查
sysdig 是一个容器排错工具，提供了开源和商业版本。对于常规排错来说，使用开源版本即可。
除了 sysdig，还可以使用其他两个辅助工具
csysdig：与 sysdig 一起自动安装，提供了一个命令行界面
sysdig-inspect：为 sysdig 保存的跟踪文件（如
sudo sysdig -w filename.scap）提供了一个图形界面（非实时）
# on Ubuntucurl -s https://s3.amazonaws.com/download.draios.com/DRAIOS-GPG-KEY.public | apt-key add -curl -s -o /etc/apt/sources.list.d/draios.list http://download.draios.com/stable/deb/draios.listapt-get updateapt-get -y install linux-headers-$(uname -r)apt-get -y install sysdig# on REHLrpm --import https://s3.amazonaws.com/download.draios.com/DRAIOS-GPG-KEY.publiccurl -s -o /etc/yum.repos.d/draios.repo http://download.draios.com/stable/rpm/draios.reporpm -i http://mirror.us.leaseweb.net/epel/6/i386/epel-release-6-8.noarch.rpmyum -y install kernel-devel-$(uname -r)yum -y install sysdig# on MacOSbrew install sysdig
# Refer https://www.sysdig.org/wiki/sysdig-examples/.# View the top network connectionssudo sysdig -pc -c topconns# View the top network connections inside the wordpress1 containersudo sysdig -pc -c topconns container.name=wordpress1# Show the network data exchanged with the host 192.168.0.1sudo sysdig fd.ip=192.168.0.1sudo sysdig -s2000 -A -c echo_fds fd.cip=192.168.0.1# List all the incoming connections that are not served by apache.sudo sysdig -p"%proc.name %fd.name" "evt.type=accept and proc.name!=httpd"# View the CPU/Network/IO usage of the processes running inside the container.sudo sysdig -pc -c topprocs_cpu container.id=2e854c4525b8sudo sysdig -pc -c topprocs_net container.id=2e854c4525b8sudo sysdig -pc -c topfiles_bytes container.id=2e854c4525b8# See the files where apache spends the most time doing I/Osudo sysdig -c topfiles_time proc.name=httpd# Show all the interactive commands executed inside a given container.sudo sysdig -pc -c spy_users# Show every time a file is opened under /etc.sudo sysdig evt.type=open and fd.name# View the list of processes with container contextsudo csysdig -pc
更多示例和使用方法可以参考 Sysdig User Guide。
Weave Scope 是另外一款可视化容器监控和排错工具。与 sysdig 相比，它没有强大的命令行工具，但提供了一个简单易用的交互界面，自动描绘了整个集群的拓扑，并可以通过插件扩展其功能。从其官网的介绍来看，其提供的功能包括
Weave Scope 由 App 和 Probe 两部分组成，它们
Probe 负责收集容器和宿主的信息，并发送给 App
App 负责处理这些信息，并生成相应的报告，并以交互界面的形式展示
+--Docker host----------+ +--Docker host----------+.---------------. | +--Container------+ | | +--Container------+ || Browser | | | | | | | | ||---------------| | | +-----------+ | | | | +-----------+ | || |----->| | scope-app |<-----. .----->| scope-app | | || | | | +-----------+ | | \ / | | +-----------+ | || | | | ^ | | \/ | | ^ | |'---------------' | | | | | /\ | | | | || | +-------------+ | | / \ | | +-------------+ | || | | scope-probe |-----' '-----| scope-probe | | || | +-------------+ | | | | +-------------+ | || | | | | | | || +-----------------+ | | +-----------------+ |+-----------------------+ +-----------------------+
kubectl apply -f "https://cloud.weave.works/k8s/scope.yaml?k8s-version=$(kubectl version | base64 | tr -d '\n')&k8s-service-type=LoadBalancer"
安装完成后，可以通过 weave-scope-app 来访问交互界面
kubectl -n weave get service weave-scope-appkubectl -n weave port-forward service/weave-scope-app :80
点击 Pod，还可以查看该 Pod 所有容器的实时状态和度量数据：
在 Ubuntu 内核 4.4.0 上面开启 --probe.ebpf.connections 时（默认开启），Node 有可能会因为内核问题而不停重启：
[ 263.736006] CPU: 0 PID: 6309 Comm: scope Not tainted 4.4.0-119-generic #143-Ubuntu[ 263.736006] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017[ 263.736006] task: ffff88011cef5400 ti: ffff88000a0e4000 task.ti: ffff88000a0e4000[ 263.736006] RIP: 0010:[] [] bpf_map_lookup_elem+0x6/0x20[ 263.736006] RSP: 0018:ffff88000a0e7a70 EFLAGS: 00010082[ 263.736006] RAX: ffffffff8117cd70 RBX: ffffc90000762068 RCX: 0000000000000000[ 263.736006] RDX: 0000000000000000 RSI: ffff88000a0e7cd8 RDI: 000000001cdee380[ 263.736006] RBP: ffff88000a0e7cf8 R08: 0000000005080021 R09: 0000000000000000[ 263.736006] R10: 0000000000000020 R11: ffff880159e1c700 R12: 0000000000000000[ 263.736006] R13: ffff88011cfaf400 R14: ffff88000a0e7e38 R15: ffff88000a0f8800[ 263.736006] FS: 00007f5b0cd79700(0000) GS:ffff88015b600000(0000) knlGS:0000000000000000[ 263.736006] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033[ 263.736006] CR2: 000000001cdee3a8 CR3: 000000011ce04000 CR4: 0000000000040670[ 263.736006] Stack:[ 263.736006] ffff88000a0e7cf8 ffffffff81177411 0000000000000000 00001887000018a5[ 263.736006] 000000001cdee380 ffff88000a0e7cd8 0000000000000000 0000000000000000[ 263.736006] 0000000005080021 ffff88000a0e7e38 0000000000000000 0000000000000046[ 263.736006] Call Trace:[ 263.736006] [] ? __bpf_prog_run+0x7a1/0x1360[ 263.736006] [] ? update_curr+0x79/0x170[ 263.736006] [] ? update_cfs_shares+0xbc/0x100[ 263.736006] [] ? update_curr+0x79/0x170[ 263.736006] [] ? dput+0xb8/0x230[ 263.736006] [] ? follow_managed+0x265/0x300[ 263.736006] [] ? kmem_cache_alloc_trace+0x1d4/0x1f0[ 263.736006] [] ? seq_open+0x5a/0xa0[ 263.736006] [] ? probes_open+0x33/0x100[ 263.736006] [] ? dput+0x34/0x230[ 263.736006] [] ? mntput+0x24/0x40[ 263.736006] [] trace_call_bpf+0x37/0x50[ 263.736006] [] kretprobe_perf_func+0x3d/0x250[ 263.736006] [] ? pre_handler_kretprobe+0x135/0x1b0[ 263.736006] [] kretprobe_dispatcher+0x3d/0x60[ 263.736006] [] ? do_sys_open+0x1b2/0x2a0[ 263.736006] [] ? kretprobe_trampoline_holder+0x9/0x9[ 263.736006] [] trampoline_handler+0x133/0x210[ 263.736006] [] ? do_sys_open+0x1b2/0x2a0[ 263.736006] [] kretprobe_trampoline+0x25/0x57[ 263.736006] [] ? kretprobe_trampoline_holder+0x9/0x9[ 263.736006] [] SyS_openat+0x14/0x20[ 263.736006] [] entry_SYSCALL_64_fastpath+0x1c/0xbb
解决方法有两种
禁止 eBPF 探测，如
--probe.ebpf.connections=false升级内核，如升级到 4.13.0
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