I kept hearing folks mention the nifty ability for WP2.x to create thumbnails when uploading images; And I never could see that as an option in my installation. A couple weeks ago I got a hint from a support forum post that mentioned "GD" was necessary. Well golly, I had a clean modern server, surely I had GD, right? Nope. Turns out that I did not. Until just now.
I did some poking around this evening and based on what I was seeing, it would appear I just needed two packages. So first I ran
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sudo yum install gd-devel
which had half a dozen dependencies. Checked the blog and... nope, still no thumbnailing. Oh yeah... PHP needs to know about it. Ok, so then ran
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sudo yum install php-gd
Restarted httpd for good measure and ta dah! I can do thumbnails automagically now. Bet I'll need to give PHP a bit more memory now, but a few tests all seemed to work.
Heady stuff, to be sure. But who knows, maybe some other poor schmuck too embarassed to ask for help will find this.
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March 5th, 2006 
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I’ve been grunting around for almost 2 hours now trying to figure out why on earth “Show: thumbnail” didn’t appear when posting, until I reached this post. Yeah, I didn’t have GD running on my test server either, but I do now and it works lovely.
I’ll always remember you for pointing this out.
Disclaimer: “Always” doesn’t necessarily means “forever”; “A week or two” is more likely.
Hey k3nny, glad I could help — and thanks for the chuckle