安装kong，需要先创建个pg库，配置pg需要的变量

docker安装kong，kong版本2.1.3，遇到下面报错

2021/01/11 04:36:57 [warn] 1#0: load balancing method redefined in /usr/local/kong/nginx-kong.conf:56
nginx: [warn] load balancing method redefined in /usr/local/kong/nginx-kong.conf:56
2021/01/11 04:36:58 [error] 1#0: init_by_lua error: /usr/local/share/lua/5.1/kong/cmd/utils/migrations.lua:16: Database needs bootstrapping or is older than Kong 1.0.

To start a new installation from scratch, run 'kong migrations bootstrap'.

To migrate from a version older than 1.0, migrated to Kong 1.5.0 first. 
If you still have 'apis' entities, you can convert them to Routes and Services
using the 'kong migrations migrate-apis' command in Kong 1.5.0.

stack traceback:
        [C]: in function 'error'
        /usr/local/share/lua/5.1/kong/cmd/utils/migrations.lua:16: in function 'check_state'
        /usr/local/share/lua/5.1/kong/init.lua:449: in function 'init'
        init_by_lua:3: in main chunk
nginx: [error] init_by_lua error: /usr/local/share/lua/5.1/kong/cmd/utils/migrations.lua:16: Database needs bootstrapping or is older than Kong 1.0.

To start a new installation from scratch, run 'kong migrations bootstrap'.

To migrate from a version older than 1.0, migrated to Kong 1.5.0 first. 
If you still have 'apis' entities, you can convert them to Routes and Services
using the 'kong migrations migrate-apis' command in Kong 1.5.0.

stack traceback:
        [C]: in function 'error'
        /usr/local/share/lua/5.1/kong/cmd/utils/migrations.lua:16: in function 'check_state'
        /usr/local/share/lua/5.1/kong/init.lua:449: in function 'init'
        init_by_lua:3: in main chunk

解决办法：容器第一次启动时，执行命令

kong migrations bootstrap