Hello and welcome this is my first guide so lets get down to business.
This build is designed to Alistar Jungle, Alistar is a very good jungler and ganker he can gank in every scene u can think of.
Alistar is a very good jungler because he can heal,heal,heal and stun stun stun the combo of Headbutt and Pulverize, one thing that u cant do is do significant damage until u get lich bane and u cant tower dive until lvl 6 but lvl 6 tower dive is really good :D.

Pros:
Incredible Ganker
Good tanky jungler
Easy Jungle
Awesome late game damage output
Very good starter for team fights
Early tower dives

Cons:
Very low damage output at low lvls
Cant solo dragon
Mana needed for damage unlike meele junglers
Need to sequence your spells perfectly and wisely

Ok jungle Alistar isnt hard.

Start in Wolves with Pulverize keep hitting without using smite.
Then go wraiths and smite the big one, lvl Triumphant Roar and kill the litle ones.
Do Dual golems recall and go do blue.
In this phase you can easy gank so gank mid or top the ones that is pushed.
Continue this sequence and keep ganking pushed lanes and have a good game :D.

The team work with Alistar is a MUST you need to know your going in for the E and Q sequence and mid has to be ready(if u have a annie in mid be sure she has stun so garantes kill).
Realise that if u dont have perfect timing your combo can fail and hard! dont over rush it and dont over slow it so keep it in mind u can fail in your combo and sabotage your own gank.

The summary in this is Alistar has jungle is one of the best gankers at early levels no1 can out gank him and believe me with perfect timing you wont fail at any gank(and im saying you not your teammates ...).
Dont try to tower dive at least until lvl 6 but when at lvl 6 you can even gank from behind turrets and push them into your team mate and still tank tower if needed.
Hope you like it and Moo OUT!