jpuyy的网志

Author: jpuyy

  • prometheus 一些监控项

    k8s 每个 node 如果大于 cpu 核数

    node_load15  > (count without(cpu, mode) (node_cpu_seconds_total{mode="idle"}) * 0.8)

    查看一个 namespace 有多少个 pod

    kube_pod_info{namespace="app"}

  • filebeat 遇到的问题

    文件描述符不够
    在 systemd 的配置文件 filebeat.service 中，配置 limit

    [Unit]
Description=Filebeat sends log files to Logstash or directly to Elasticsearch.
Documentation=https://www.elastic.co/products/beats/filebeat
Wants=network-online.target
After=network-online.target

[Service]
ExecStart=/usr/share/filebeat/bin/filebeat -c /etc/filebeat/filebeat.yml -path.home /usr/share/filebeat -path.config /etc/filebeat -path.data /var/lib/filebeat -path.logs /var/log/filebeat
Restart=always
LimitNOFILE=1000000
LimitNPROC=1000000

[Install]
WantedBy=multi-user.target

  • aliyun ecs vpc 使用自建 nameserver

    对于 dhcp 获取 ip 的 vpc ecs，会强制更改 /etc/resolv.conf，使用如下方式防止替换

    /etc/sysconfig/network-scripts/ifcfg-eth0 添加 PEERDNS=no

  • kubespray 使用遇到的问题

    1 问题：

    FAILED! => {“changed”: false, “module_stderr”: “sudo: sorry, you must have a tty to run sudo\n”, “module_stdout”: “”, “msg”: “MODULE FAILURE\nSee stdout/stderr for the exact error”, “rc”: 1}

    解决 visudo，将 Defaults requiretty 注释掉

    2.

    FAILED! => {“changed”: false, “msg”: “Failed to reload sysctl: vm.max_map_count = 262144\nnet.ipv4.ip_forward = 1\nsysctl: cannot stat /proc/sys/net/bridge/bridge-nf-call-ip6tables: No such file or directory\nsysctl: cannot stat /proc/sys/net/bridge/bridge-nf-call-iptables: No such file or directory\n”}
    解决:

    modprobe br_netfilter

  • kubectl kubectx kubens 快速切换集群和 namespace

    集群和 namespace 信息配置在

     ~/.kube/config

    查看当前的 context

    kubectl config current-context

    切换 namespace

    alias kcd='kubectl config set-context $(kubectl config current-context) --namespace'

    切换集群

    kubectl config use-context dev-admin@dev

    使用工具进行快速切换

    https://github.com/ahmetb/kubectx

    brew install kubectx

    查看 config 配置

    kubectl config view

  • pycharm terminal git bash windows

    windows 自带的 terminal 太难用了，用 git bash

    https://stackoverflow.com/questions/20573213/embed-git-bash-in-pycharm-as-external-tool-and-work-with-it-in-pycharm-window-w

    git bash upgrade
    $ git version
    git version 2.24.0.windows.2

    $ git update-git-for-windows

    Or download from official site
    https://git-scm.com/downloads