Re: [ovirt-users] Add multiple files to a VM via cloud-init

On 10/31/2014 06:47 PM, Branimir Pejakovic wrote: > > > > On Thu, Oct 30, 2014 at 12:52 PM, Branimir Pejakovic > <branimirp(a)gmail.com <mailto:branimirp@gmail.com>> wrote: > > > > On Thu, Oct 30, 2014 at 12:39 PM, Shahar Havivi <shaharh(a)redhat.com > <mailto:shaharh@redhat.com>> wrote: > > On 30.10.14 12:30, Branimir Pejakovic wrote: > > On Thu, Oct 30, 2014 at 12:02 PM, Shahar Havivi > <shaharh(a)redhat.com <mailto:shaharh@redhat.com>> wrote: > > > > > On 30.10.14 10:06, Branimir Pejakovic wrote: > > > > On Thu, Oct 30, 2014 at 7:22 AM, Shahar Havivi > <shaharh(a)redhat.com <mailto:shaharh@redhat.com>> > > > wrote: > > > > > > > > > On 29.10.14 17:35, Branimir Pejakovic wrote: > > > > > > Hi list, > > > > > > > > > > > > I was wondering is there a way to add multiple files > to a vm via > > > > > cloud-init > > > > > > using python SDK. I was able to add /etc/resolv.conf and > > > additionally I > > > > > > would like to add config files for NICs (ifcfg-ethX) > with appropriate > > > > > > values (ip,gw,netmask). I used an example given here: > > > > > > http://www.ovirt.org/Features/Cloud-Init_Integration . But > > > > > unfortunately I > > > > > > cannot do the same thing If I want to write multiple > files to a vm in > > > > > > params.Action class. > > > > > > > > > > > > Thank you in advance! > > > > > you can use the custom script text box in oVirts > cloud-init section, > > > > > there you can add any cloud-init section - adding files > examples can be > > > > > found > > > > > here: > > > > > > > > > > > > > > http://cloudinit.readthedocs.org/en/latest/topics/examples.html#writing-o... > > > > > > > > > > Shahar Havivi. > > > > > > > > > > > > > > Hi Shahar, > > > > > > > > Thank you for the reply. > > > > > > > > To be honest I knew for those scripts but I want to do it > in automate > > > > fashion just like in that example that I put in my > original message. I > > > have > > > > tried to specify in params.Files class multiple files: > > > > > > > > vm_file1 = params.Files(file=[params.File(name = 'file1', > content = > > > > file1_content, type_= 'PLAINTEXT')]) > > > > vm_file2 = params.Files(file=[params.File(name = 'file2', > content = > > > > file2_content, type_= 'PLAINTEXT')]) > > > > > > > > and then give them as arguments to params.CloudInit _init_ > constructor > > > > (files=...) just like in that example above but it seems > that I am doing > > > > something wrong because it does not write multiple files - > it writes only > > > > when you specify one file all right. The exception is > "Error: 'list' > > > object > > > > has no attribute 'export'" (I tried to specify those files > as a list - > > > > files=[vm_file1,vm_file2]). > > > > > > > > Thanks for any help. > > > The custom script is currently the only option to add files > via Cloud-Init > > > > > > Thanks, > > > Shahar Havivi. > > > > > > > > Hi Shahar, > > > > Granted. But the example in python > > http://www.ovirt.org/Features/Cloud-Init_Integration uses > custom script :) > > I just want to know how to do the same thing in case when I > want to write > > more than one file to a VM - and yes - all those multiple > files that I > > want to write are specified via custom scripts. > > > > From the link - (The "Python SDK" paragraph: scontent object > holds the > > custom script): > > > > scontent = "write_files:\n- content: |\n search > > example.com <http://example.com>\n nameserver > 10.10.10.1\n nameserver > > 10.10.10.2\n path: /etc/resolv.conf" > > > > For example (and just for example), I want to write to > /etc/issue and > > /etc/hosts not only /etc/resolv.conf. In essence, when vm goes > to run-once > > mode I want to write more than one file to a vm via Python (using > > CloudInit) in automated fashion (and not touching oVirt GUI at > all). > You don't need to use the GUI, > the sdks initialization have custom_script as string which is > equivalent to > the text box that you see in the GUI, and you can put the same > content there > (ie multiple files). > Is that sufficient enough? > > > Hi Shahar, > > Thanks! I will try this one. I was not aware of this feature. > Although I can see that it was mentioned on the list (my bad). > > Thank you for your effort! I really do appreciate it! > > > > Hi, > > Please if somebody can help me because I am pretty stuck. As I said in > previous posts I used this Python example > http://www.ovirt.org/Features/Cloud-Init_Integration to set root > password, hostname and resolv.conf. It worked without any problems for > 3.4 oVirt version and equivalent Python SDK > (ovirt-engine-sdk-python-3.4.x.noarch). > > Then, I have tried to write through yuml scripts more conf files than > just resolv.conf to configure guest. I also saw this post on the list: > http://lists.ovirt.org/pipermail/users/2014-October/028539.html. So > based on that, I decided to upgraded oVirt and SDK > (ovirt-engine-sdk-python-3.5.0.7-1.el6.noarch) to 3.5 version. The > upgrade itself passed without any problem. > > From that point forward I tried to use custom_script parameter (as > suggested by Shahar) inside Initialization class and CloudInit class > without any luck. > > Can somebody please provide a simple Python code to submit yaml script > to cloud-init? > > Also after the upgrade the example script I mentioned above can only > change hostname. It does not write resolv.conf anymore nor it sets root > password. I don't know if something is changed inside methods? For > example, customization of virtual machine (memory,cpu,high availability, > pinning to a certain host etc works without any problems). > > Thank you! > > Best regards, > > Branimir > The "custom_script" element doesn't work in combination with cloud-init and run once. To make it work you have to use cloud-init and a file element containing your custom script. Here you have an example: #!/usr/bin/python import base64 import re from ovirtsdk.api import API from ovirtsdk.xml import params # A simple function to encode using base64 and now new lines: def encode(s): return re.sub("\s+", "", base64.encodestring(s)) # Connect to the server: api = API( url="https://engine35.example.com/ovirt-engine/api";, username="admin@internal", password="redhat123", insecure=True, debug=True ) # Find the virtual machine: myvm = api.vms.get(name="myvm") # Prepare the cloud-init custom script to write files: myscript = """\ write_files: """ # Append one file: myscript += """\ - encoding: b64 content: %s owner: root:root path: /etc/firstfile.txt permissions: '0644' """ % encode("The content of the first file") # Append another file: myscript += """\ - encoding: b64 content: %s owner: root:root path: /etc/secondfile.txt permissions: '0644' """ % encode("The content of the second file") # Prepare the action to trigger initialization using cloud-init: action = params.Action( vm=params.VM( initialization=params.Initialization( cloud_init=params.CloudInit( files=params.Files( file=[ params.File( name="myscript", type_="plaintext", content=myscript ) ] ) ) ) ) ) # Start the virtual machine: myvm.start(action) # Disconnect from the server: api.disconnect() Regarding the problem with the root password we have a bug in 3.5 that makes this fail. See here: https://bugzilla.redhat.com/1156155 The problem is that we are not passing the user name to cloud-init, and as a result it is changing the default cloud-init user password, not the root pssword. To workaround the issue you can edit the "/etc/cloud/cloud.cfg" file of the VM and change the default user name: system_info: distro: ... default_user: name: root <-- Change this from "fedora" or "cloud-init" to root -- Dirección Comercial: C/Jose Bardasano Baos, 9, Edif. Gorbea 3, planta 3ºD, 28016 Madrid, Spain Inscrita en el Reg. Mercantil de Madrid – C.I.F. B82657941 - Red Hat S.L.