bash - Cannot write into ~/.m2 in docker maven container -


why aren't files written in /root/.m2 in maven3 docker image persistent during build?

a simple dockerfile:

from maven:3-jdk-8 run touch /root/.m2/testfilehere && ls -a /root/.m2 run  ls -a /root/.m2 cmd ["bash"]

produces following output.

$ docker build -t test --no-cache . sending build context docker daemon 2.048 kb step 1 : maven:3-jdk-8  ---> 42e3884987fb step 2 : run touch /root/.m2/testfilehere && ls -a /root/.m2  ---> running in 1c1dc5e9f082 . .. testfilehere  ---> 3da352119c4d removing intermediate container 1c1dc5e9f082 step 3 : run ls -a /root/.m2  ---> running in df506db8c1dd . ..  ---> d07cc155b20e removing intermediate container df506db8c1dd step 4 : run stat  /root/.m2/testfilehere  ---> running in af44f30aafe5 stat: cannot stat ‘/root/.m2/testfilehere’: no such file or directory command '/bin/sh -c stat  /root/.m2/testfilehere' returned non-zero code: 1

the file created @ first command gone when intermmediate container exists.

also, not happen in ubuntu image, maven.

edit: using add hostfile /root/.m2/containerfile work workaround, not want.

that's because /root/.m2 defined volume in image. when container runs volume, volume storage is not part of unionfs - data not stored in container's writable layer:

a data volume specially-designated directory within 1 or more containers bypasses union file system.

the first run command creates file in volume, that's in intermediary container own volume. file isn't saved image layer because it's in volume.

the second run command running in new intermediary container has own volume. there's no content in volume base image, volume empty in new container.

if want pre-populate volume data, need in dockerfile you've seen.


-

Comments

Post a Comment

Popular posts from this blog

angular - Is it possible to get native element for formControl? -

i've got angular2 reactive form . created formcontrol s , assigned input fields by [formcontrol]=... . understand creates nativeelement <-> formcontrol link. my question: possible nativeelement formcontrol ? wanna myformcontrol.nativeelement.focus() i can share 1 terrible solution works me. in reactive forms can use either 1) formcontroldirective ts mycontrol = new formcontrol('') template <input type="text" [formcontrol]="mycontrol"> or 2) formcontrolname ts myform: formgroup; constructor(private fb: formbuilder) {} ngoninit() { this.myform = this.fb.group({ foo: '' }); } template <form [formgroup]="myform"> <input type="text" formcontrolname="foo"> </form> so these directives write patch like 1) formcontroldirective const originformcontrolngonchanges = formcontroldirective.prototype.ngonchanges; formcontroldirective.proto
Read more

unity3d - Rotate an object to face an opposite direction -

i have object , b. when click on object b, rotates object b (a faces b). b doesn't face a. need following : when faces b, need face opposite direction. have code rotating @ b. how rotate face opposite direction after that? vector3 targetdirection = target - transform.position; float step = speed * time.deltatime; vector3 newdirection = vector3.rotatetowards (turretdome.transform.forward, targetdirection, step, 0.0f); turretdome.transform.rotation = quaternion.lookrotation (newdirection); you object facing object b, want inverse direction of object after that? objecta.transform.rotation = quaternion.inverse(objecta.transform.rotation) but lets assume example turretdome object a, (negate direction): turretdome.transform.rotation = quaternion.lookrotation (-newdirection); naturally, both of these snippets not show how smoothen rotation, seem know how use time.deltatime. just incase unsure, quaternion.lerp this
Read more

javascript - Why jQuery Select box change event is now working? -

i working on product filters user select select box according his/her preference not getting selected value user in jquery. html code:- <select name="product_filter" id="product_filter"> <option value="price_low_first">price : low high</option> <option value="price_high_first">price : high low</option> <option value="latest">latest</option> <option value="popular">most popular</option> </select> jquery code: $(function () { $("#product_filter").change(function () { alert("hi") var selectedtext = $(this).find("option:selected").text(); var selectedvalue = $(this).val(); alert("selected text: " + selectedtext + " value: " + selectedvalue); }); }); hi believe code perfect. once please check jquery.min.js
Read more