I found pixelfed really hard to install. Maybe I was just doing something wrong, and I was admittedly not using docker, but I had to deviate from the instructions at least once, and I never got federation with mastodon full working. It was also very bloated. My server is a fairly weak vps, but it bumped my resource usage (disk and processor) up by like 40%. I eventually settled on Piwigo, which I like a lot.