。。。

kubectl get pods -n kube-system
mdadm —create /dev/md0 —level=5 —raid-devices=3 —spare-devices=1 /dev/sd[a-d]1
动态查看 tail -f /var/log/….
错误日志 /var/log/
显示行数 set nu
C:\Windows\System32\drivers\etc
yum tab补全：yum install -y bash-com
raid0 mdadm -Cv /dev/md0 -l 1 -n 2 /dev/sdb[1-2]
OpenStack刷新文件
[root@controller ~]# source /etc/keystone/admin-openrc.sh
Docker Swarm容器编排
[root@master ~]# docker service create —name portainer —publish 9000:9000 —replicas=1 —constraint ‘node.role == manager’ —mount type=bind,src=//var/run/docker.sock,dst=/var/run/docker.sock —mount type=volume,src=portainer_data,dst=/data portainer/portainer -H unix:///var/run/docker.sock
主从
[root@xnode2 ~]# vi /etc/my.cnf
[mysqld]
log_bin=mysql-bin
binlog_igone_db=mysql
server_id=12
一授权：
MariaDB [(none)]> grant all privileges on .* to root@’%’ identified by “123456”;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> grant replication slave on . to ‘user’@’xnode3’ identified by ‘123456’;
Query OK, 0 rows affected (0.00 sec)
二：
MariaDB [(none)]> change master to master_host=’xnode2’,master_user=’user’,master_password=’123456’;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> start slave;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> show slave status\G

读写分离：
解压到/usr/local
授权之后
echo export MYCAT_HOME=/usr/local/mycat/>>/etc/profile
[root@xnode1 ~]# vi /usr/local/mycat/conf/schema.xml
[root@xnode1 ~]# chown root:root /usr/local/mycat/conf/schema.xml
[root@xnode1 ~]# vi /usr/local/mycat/conf/server.xml
USERDB 然后删
/bin/bash /usr/local/mycat/bin/mycat start 启动查端口

zookeeper：
[root@xnode1 zookeeper-3.4.14]# cd conf/
重命名zoo,配置
server.1=192.168.200.11:2888:3888

[root@xnode1 conf]# mkdir /tmp/zookeeper
[root@xnode1 conf]# vi /tmp/zookeeper/myid
1
bin下启动

kafka
[root@xnode1 ~]# vi kafka_2.11-1.1.1/config/server.properties
注释
#broker.id=0
#zookeeper.connect=localhost:2181
底部添加
broker.id=1
zookeeper.connect=192.168.200.11:2181,192.168.200.12:2181,192.168.200.13:2181
listeners=PLANINTEXT://192.168.200.11:9092
三台都弄
[root@xnode1 bin]# ./kafka-server-start.sh -daemon ../config/server.properties 启动

KVM
[root@xnode1 ~]# yum install -y qemu-kvm openssl libvirt
[root@xnode1 ~]# systemctl start libvirtd
[root@xnode1 ~]# ln /usr/libexec/qemu-kvm /usr/bin/qemu-kvm
[root@xnode1 ~]# chmod +x qemu-ifup-NAT