select version();

select date_trunc('second',current_timestamp - pg_postmaster_start_time()) as uptime;

select pg_size_pretty(pg_database_size(current_database()));

select datname, usezname, state, query from pg_stat_activity;

python3 -c "import random;print('heads' if random.randint(0,1) == 0 else 'tails')"

1)  kubectl get namespace kuboard -o json > kuboard.json
2)  编辑kuboard.json ,  Remove kubernetes from the finalizers array
3)  kubectl replace --raw "/api/v1/namespaces/kuboard/finalize" -f kuboard.json

$sudo lvdisplay
  LV Path                /dev/ubuntu-vg/ubuntu-lv

**查看并记下LV的Path

$ sudo pvdisplay 
PV Size               <63.00 GiB / not usable 0

** 查看PV的实际大小

$ sudo lvextend -L 62G /dev/ubuntu-vg/ubuntu-lv

**根据前两步的LVPath和PV大小，扩容到（比PV最大略小1、2G才够分配）

$ sudo resize2fs /dev/ubuntu-vg/ubuntu-lv

**让OS识别新的PV