Month: October 2021

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Let’s Encrypt certificate expired on older Macs

I have a number of older machines that I use on a regular basis, so I’m no stranger to the struggles of not being able to browse current websites on older machines with older browsers and the typical SSL/TLS support issues that you run into. I was surprised to see this error this week on my 2008 Mac Pro running Mac OS X 10.11 El Capitan and a latest version of Chrome:

Looking at the certificate for any site not loading it looks like the certificate has expired:

I’m not seeing this on my other later/current machines though, so clearly something on these older machines is no longer getting updates. Browsing around a few other sites and seeing the same issue on many sites so it was not just limited to a single site, so I realized something else was going on. Some Googling found this article:

DST Root CA X3 expired Mac

Following the steps to download the updated certificate from LetsEncrypt and install it into Keychain did the job.

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Running aitextgen model training in a Docker container

I’m setting up an approach to run text generation model training jobs on demand with aitextgen, and the first approach I’m looking at is to run the training in a Docker container. Later I may move this to an AWS service like ECS, but this is my first step.

I’ve built a Docker image with the following dockerfile:

FROM amazonlinux
RUN yum update -y
RUN yum install -y python3
RUN pip3 install aitextgen
ADD source-file-for-fine-tuning.txt .
ADD generate.py .
ADD train.py .

.. and then built my image with:

docker build -t aitextgen .

I then run a container passing in the cmd I want to run, in this case ‘python3 train.py’:

docker run --volume /data/trained_model:/trained_model:rw -d aitextgen sh -c "cd / && python3 train.py && mv aitextgen.tokenizer.json /trained_model"

I’m also attaching a bind point where the model output is being written to during the run, and -d to run the container in the background. The last step in the run command copies the token file to the mounted EBS volume so it can be reused by the generation.

To generate text from the model, run:

docker run --volume /data/trained_model:/trained_model:rw -d aitextgen sh -c "cd / && python3 generate.py"
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Mount as EBS volume inside a EC2 instance

By default, if you provision and attach additional EBS volumes for an EC2 instance, they don’t get mounted by default.

The boot EBS is usually /dev/xvda1. Each additional EBS volume should be /dev/xvdb and so on.

First format the new volume:

sudo mkfs -t ext4 /dev/xvdb

Make a mount mount directory like /data, then mount it with:

sudo mount /dev/xvdb /data

Now you should see the new volume available:

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        3.9G     0  3.9G   0% /dev
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           3.9G  432K  3.9G   1% /run
tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/xvda1       20G  8.8G   12G  44% /
tmpfs           798M     0  798M   0% /run/user/1000
/dev/xvdb       7.8G   36M  7.3G   1% /data

Add a line to /etc/fstab to mount on startup:

/dev/xvdb /data ext4 defaults,nofail 0 2

These steps are from multiple places, mainly answers to this question.

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