Try the Commands Troubleshooting and Help page if you get stuff with server errors.
Minecraft summon shulker command
Using the summon command to spawn in a minecraft shulker is simple, take the command and enter into chat and presto you have a shulker. Shulkers have a Color tag for the 16 different colors.
APX, APY, APZ are coordinates, but don't seem to have an effect. AttachFace doesn't have an effect.
Peek NBT
This tag sets height of the lid of the Shulker, this really only seems to work if the Shulker has no AI, as with AI it will close the lid and set the hight back to normal.
/summon minecraft:shulker ~ ~ ~ {Peek:127,NoAI:1}
How to summon a White Shulker
To spawn in a white shulker use the Color Nbt tag. Set Color:0 and you will get a white shulker.
/summon minecraft:shulker ~ ~ ~ {Color:0}How to summon a Orange Shulker
To spawn in a orange shulker use the Color Nbt tag. Set Color:1 and you will get a orange shulker.
/summon minecraft:shulker ~ ~ ~ {Color:1}How to summon a Magenta Shulker
To spawn in a magenta shulker use the Color Nbt tag. Set Color:2 and you will get a magenta shulker.
/summon minecraft:shulker ~ ~ ~ {Color:2}How to summon a Light Blue Shulker
To spawn in a light blue shulker use the Color Nbt tag. Set Color:3 and you will get a light blue shulker.
/summon minecraft:shulker ~ ~ ~ {Color:3}How to summon a Yellow Shulker
To spawn in a yellow shulker use the Color Nbt tag. Set Color:4 and you will get a yellow shulker.
/summon minecraft:shulker ~ ~ ~ {Color:4}How to summon a Lime Shulker
To spawn in a lime shulker use the Color Nbt tag. Set Color:5 and you will get a lime shulker.
/summon minecraft:shulker ~ ~ ~ {Color:5}How to summon a Pink Shulker
To spawn in a pink shulker use the Color Nbt tag. Set Color:6 and you will get a pink shulker.
/summon minecraft:shulker ~ ~ ~ {Color:6}How to summon a Gray Shulker
To spawn in a gray shulker use the Color Nbt tag. Set Color:7 and you will get a gray shulker.
/summon minecraft:shulker ~ ~ ~ {Color:7}How to summon a Light Gray Shulker
To spawn in a light gray shulker use the Color Nbt tag. Set Color:8 and you will get a light gray shulker.
/summon minecraft:shulker ~ ~ ~ {Color:8}How to summon a Cyan Shulker
To spawn in a cyan shulker use the Color Nbt tag. Set Color:9 and you will get a cyan shulker.
/summon minecraft:shulker ~ ~ ~ {Color:9}How to summon a Purple Shulker
To spawn in a purple shulker use the Color Nbt tag. Set Color:10 and you will get a purple shulker.
/summon minecraft:shulker ~ ~ ~ {Color:10}How to summon a Blue Shulker
To spawn in a blue shulker use the Color Nbt tag. Set Color:11 and you will get a blue shulker.
/summon minecraft:shulker ~ ~ ~ {Color:11}How to summon a Brown Shulker
To spawn in a brown shulker use the Color Nbt tag. Set Color:12 and you will get a brown shulker.
/summon minecraft:shulker ~ ~ ~ {Color:12}How to summon a Green Shulker
To spawn in a green shulker use the Color Nbt tag. Set Color:13 and you will get a green shulker.
/summon minecraft:shulker ~ ~ ~ {Color:13}How to summon a Red Shulker
To spawn in a red shulker use the Color Nbt tag. Set Color:14 and you will get a red shulker.
/summon minecraft:shulker ~ ~ ~ {Color:14}How to summon a Black Shulker
To spawn in a black shulker use the Color Nbt tag. Set Color:15 and you will get a black shulker.
/summon minecraft:shulker ~ ~ ~ {Color:15}Suggestions or found a bug
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If you're looking for a particular summon mob generator you can link to these specific versions of the command generator.