涉及awk、Here Document、mysql。
1. 在主机上通过mysql客户端工具连接
#!/bin/bash
tidb_dir=/home/*/tidb/bin
tidb_ip=`kubectl get svc -A | grep tidb | grep 4000 | awk '{print $4}'`
cd ${tidb_dir}
chmod +x mysql
./mysql -h${tidb_ip} -P4000 -uadmin -padmin << EOF
select version();
select 9 > '10';
EOF
2. 在pod中通过mysql客户端工具连接
#!/bin/bash
ns_xxx=`kubectl get ns | grep ^xxx | awk '{print $1}'`
pod_yyy=`kubectl get pods -A | awk '{print $2}' | grep ^yyy`
# 注意这里需要去掉-t,否则会有以下告警:
# Unable to use a TTY - input is not a terminal or the right kind of file
kubectl exec -n ${ns_xxx} -i ${pod_yyy} bash -- mysql -hbasic-tidb -P4000 -uadmin -padmin << EOF
select version();
select 9 > '10';
EOF
kubectl -n ${ns_xxx} delete pod ${pod_yyy}