updated docs

README.md

@@ -1,6 +1,8 @@
 # MongoDB Builder for Linux
 
-This Docker image builds MongoDB for Linux from source without OpenSSL and cURL, similar to the generic Linux packages that are [not provided anymore since MongoDB 4.2](https://www.mongodb.com/blog/post/a-proposal-to-endoflife-our-generic-linux-tar-packages).
+This Docker image builds MongoDB for Linux from source without OpenSSL and cURL, similar to the generic Linux packages
+that
+are [not provided anymore since MongoDB 4.2](https://www.mongodb.com/blog/post/a-proposal-to-endoflife-our-generic-linux-tar-packages).
 
 ## Building the Image
 
@@ -10,8 +12,35 @@ docker build -t mongodb-builder .
 
 ## Usage
 
-The `run-builder.sh` script downloads the MongoDB source, builds `mongod` and `mongo`, and creates an archive (`mongodb-linux-x86_64-*.tgz`):
+The `run-builder.sh` script downloads the MongoDB source, builds `mongod` and `mongo`, and creates an
+archive (`mongodb-linux-x86_64-*.tgz`):
 
 ```sh
 ./run-builder.sh
 ```
+
+### Side notes!
+
+Use an AWS big machine with some cores(need to update the j flag in ./run-builder.sh) and a lot of memory. I used a
+r3.4xlarge with 16 cores and 123GB of memory. It took about 1 hours to build.
+
+Remember to setup git and ssh keys on the machine you are building on. The build script will clone the mongodb repo and
+you will need to be able to do that.
+
+at the end of the script it will open the /build/install/bin directory and you will see a mongod and mongo or mongos
+binary, that is the one that you strip and ship. the two last lines of run-builder.sh will do that for you.
+
+Having your tarball you should create a git tag:
+
+    ```sh
+    git tag -a v4.2.0 -m "MongoDB 4.2.0"
+    git push origin <tag_name>
+    ```
+
+Normally you will not commit your tarball to git. You have two options:
+
+create a branch and commit your tarball to that branch, create a PR and download the tarball from the PR and update the release tag.
+
+or you can send to an S3 and download it from there and update the tag with the tarball.
+
+If you have a big enough machine you can do it in your local machine.