On Linux i used to fire this command
docker logs wp-mysql 2>&1 | grep "ready for connections" However, I wish to search for the string on Windows
I tried the below two attempts but it shows not just the searched lines but also a few extra lines which I do not need.
docker logs wp-mysql 2>&1 | findstr "ready for connections" and
docker logs wp-mysql 2> >(findstr 'ready for connections') Can you please suggest a grep alternative for searching string in docker logs on Windows please?
This command searches for any of the strings "ready", "for" or "connections":
findstr "ready for connections" This command searches for the string "ready for connections":
findstr /C:"ready for connections" This command should solve your problems:
docker logs wp-mysql 2>&1 | findstr /C:"ready for connections" Or this one, provided the native windows command find is the first one found in your path, the default install location is in C:\Windows\System32, but some people prefer to put the path to the unix find command before the build-in windows find command:
docker logs wp-mysql 2>&1 | find "ready for connections" Use the option /? to show how to use a windows command line utility. Look at the ouput of these two commands:
findstr /? find /? 
docker service logs as I have a swarm with multiples replicas. I try to filter logs with docker service logs -t consumer| findstr /C:'consumer.2' but I still get consumer.4 consumer.5 logs etc....
double quotes not single quotes in the findstr command AND you are using find instead of findstr, and the /C switch works differently between the two. In cmd type help find and help findstr and read about how they work.docker service logs -f consumer | findstr /C: "consumer.1" will give me logs for consumer.2, consumer.3 etc. But I want to only consumer.1. Grep would do just that. The select-string -pattern "consumer.1" does the same, prints logs for all consumers, not just 1. I am unable to find a solution that works exactly as grep, dropping out strings that do not match the given pattern.Let me give a practical example of usage.
Here is an example together with Docker logs. I have running a Docker container with container id starting with 42. I want to see why the Docker container fails at start. It tries to connect to Mongoose DB and container fails. I redirect the output and I use select-string to achieve this.
First I run this command :
docker logs 42 2>&1 | select-string -pattern "Error" | select LineNumber,Line This then gives me both the LineNumber and the Line, so I can see where in the output I have the pattern with text "Error".
LineNumber Line ---------- ---- 1 connection error: MongooseServerSelectionError: getaddrinfo ENOTFOUND mongodb 31 compatibilityError: null, 42 MongooseServerSelectionError: getaddrinfo ENOTFOUND mongodb 66 error: Error: getaddrinfo ENOTFOUND mongodb 68 name: 'MongoNetworkError' 86 compatibilityError: null, You can use this on similar streams such as strings and files that are string based in Powershell.
