[root@192 mongotest]# docker-compose up -d

mongotest_mongo_1 is up-to-date

[root@192 mongotest]# docker ps|grep mongotest

2e8cf9190362   mongo           "docker-entrypoint.s…"   2 hours ago   Up 2 hours   0.0.0.0:27017->27017/tcp, :::27017->27017/tcp   mongotest_mongo_1

[root@192 mongotest]# docker exec -it mongotest_mongo_1 mongo

OCI runtime exec failed: exec failed: unable to start container process: exec: "mongo": executable file not found in $PATH: unknown