$ echo 'hahahahaha` > test.yaml 
$ 
$ sudo apisix start -c test.yaml 
/usr/local/openresty//luajit/bin/luajit /usr/local/apisix/apisix/cli/apisix.lua start -c test.yaml
Use customized yaml:    test.yaml
/usr/local/openresty//luajit/bin/luajit: /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:707: failed to classify line: hahahahaha
stack traceback:
        [C]: in function 'error'
        /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:707: in function 'parsemap'
        /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:793: in function 'parsedocuments'
        /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:818: in function 'parse'
        /usr/local/apisix/apisix/cli/file.lua:241: in function 'read_yaml_conf'
        /usr/local/apisix/apisix/cli/ops.lua:174: in function 'init'
        /usr/local/apisix/apisix/cli/ops.lua:826: in function </usr/local/apisix/apisix/cli/ops.lua:742>
        /usr/local/apisix/apisix/cli/ops.lua:959: in function 'execute'
        /usr/local/apisix/apisix/cli/apisix.lua:40: in main chunk
        [C]: at 0x00405290
$ 
$ sudo apisix start
/usr/local/openresty//luajit/bin/luajit /usr/local/apisix/apisix/cli/apisix.lua start
/usr/local/openresty//luajit/bin/luajit: /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:707: failed to classify line: hahahahaha
stack traceback:
        [C]: in function 'error'
        /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:707: in function 'parsemap'
        /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:793: in function 'parsedocuments'
        /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:818: in function 'parse'
        /usr/local/apisix/apisix/cli/file.lua:241: in function 'read_yaml_conf'
        /usr/local/apisix/apisix/cli/ops.lua:174: in function 'init'
        /usr/local/apisix/apisix/cli/ops.lua:826: in function </usr/local/apisix/apisix/cli/ops.lua:742>
        /usr/local/apisix/apisix/cli/ops.lua:959: in function 'execute'
        /usr/local/apisix/apisix/cli/apisix.lua:40: in main chunk
        [C]: at 0x00405290
$
$ sudo apisix reload
/usr/local/openresty//luajit/bin/luajit /usr/local/apisix/apisix/cli/apisix.lua reload
/usr/local/openresty//luajit/bin/luajit: /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:707: failed to classify line: hahahahaha
stack traceback:
        [C]: in function 'error'
        /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:707: in function 'parsemap'
        /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:793: in function 'parsedocuments'
        /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:818: in function 'parse'
        /usr/local/apisix/apisix/cli/file.lua:241: in function 'read_yaml_conf'
        /usr/local/apisix/apisix/cli/ops.lua:174: in function 'init'
        /usr/local/apisix/apisix/cli/ops.lua:916: in function </usr/local/apisix/apisix/cli/ops.lua:914>
        /usr/local/apisix/apisix/cli/ops.lua:959: in function 'execute'
        /usr/local/apisix/apisix/cli/apisix.lua:40: in main chunk
        [C]: at 0x00405290
$
$ sudo apisix restart
/usr/local/openresty//luajit/bin/luajit /usr/local/apisix/apisix/cli/apisix.lua restart
/usr/local/openresty//luajit/bin/luajit: /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:707: failed to classify line: hahahahaha
stack traceback:
        [C]: in function 'error'
        /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:707: in function 'parsemap'
        /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:793: in function 'parsedocuments'
        /usr/local/apisix/deps/share/lua/5.1/tinyyaml.lua:818: in function 'parse'
        /usr/local/apisix/apisix/cli/file.lua:241: in function 'read_yaml_conf'
        /usr/local/apisix/apisix/cli/ops.lua:174: in function 'init'
        /usr/local/apisix/apisix/cli/ops.lua:865: in function 'test'
        /usr/local/apisix/apisix/cli/ops.lua:908: in function </usr/local/apisix/apisix/cli/ops.lua:906>
        /usr/local/apisix/apisix/cli/ops.lua:959: in function 'execute'
        /usr/local/apisix/apisix/cli/apisix.lua:40: in main chunk
        [C]: at 0x00405290