实用命令

• 不重启扫描硬盘

for dirname in `ls /sys/class/scsi_device/`; do echo 1 > /sys/class/scsi_device/$dirname/device/rescan ; done
for dirname in `ls /sys/class/scsi_host/`;do echo "- - -" > /sys/class/scsi_host/$dirname/scan; done

• git 设置代理

git config --global http.proxy http://172.18.80.222:41091
git config --global https.proxy http://172.18.80.222:41091
git config --global --unset http.proxy
git config --global --unset https.proxy

• git 记住密码

git config --global credential.helper store

• Ubuntu apt 设置代理

echo 'Acquire::http::Proxy "http://172.18.80.222:41091";' > /etc/apt/apt.conf.d/10proxy

• Linux 虚拟机使用代理

export http_proxy="http://172.18.80.222:41091"
export https_proxy="http://172.18.80.222:41091"

• Ubuntu 快速安装 GlusterFS

add-apt-repository ppa:gluster/glusterfs-6
apt install glusterfs-client glusterfs-server -y

• 清理 Ceph 盘

dmsetup ls
dmsetup remove ceph-**

• 快速生成证书

openssl genrsa -out tls.key 2048
openssl req -new -x509 -key tls.key -out tls.cert -days 360 -subj /CN=www.zze.com

• kubectl 设置命令补全

apt install bash-completion -y
kubectl completion bash > /usr/share/bash-completion/completions/kubectl \
&& . /usr/share/bash-completion/completions/kubectl

• 一键安装 Docker

curl -fsSL https://get.docker.com | bash -s docker --mirror Aliyun

• k8s 为制定命名空间设置默认的拉取镜像密钥

kubectl patch serviceaccount default -p '{"imagePullSecrets": [{"name": "<secret-name>"}]}'

• 用环境变量替换模板中的占位符

$ cat test.tpl 
name: ${name}
age: ${age}
$ name=zze age=24 envsubst < test.tpl 
name: zze
age: 24

• 查看 k8s 集群相关信息

# 查看所有节点上已有的污点
$ kubectl describe nodes  | grep -oPz 'Taints.*?(.|\n)*?Unschedulable|Name:.*' | grep Unschedulable -v
# 查看所有节点上已有的标签
$ kubectl describe nodes  | grep -oPz 'Lab.*?(.|\n)*?Annotations|Name:.*' | grep Annotations -v

• git 记住密码

git config --global credential.helper store
git credential-store store