There shouldn't be a strict limit, but in practice this is limited by some unknown factors. Most inportantly the keyboard buffer have a limited size and the likelihood of errors increases when the number of characters increases.
If you want to make this reliable download the password from http_directory in your kickstart/preseed file or better a ssh public key. On Mon, Feb 11, 2019, 08:47 IB <bridges....@gmail.com wrote: > Hello, > > I have been using the boxcutter Ubuntu 16.04 desktop JSON file to > generate images (https://github.com/boxcutter/ubuntu). The boxcutter JSON > files work just fine out of the box. However, I noticed that when I went to > change the user password ("ssh_password" in ubuntu.json) to something > much longer, I started running into ssh handshake errors. As I changed the > password length, I noticed that the points at which the image creation > process failed would change as well. I started paying attention to the VM > itself during installation (through VMWare Workstation), and observed that > with the longer password, the boot options string (generated from my > boot_commands array) was being truncated. For every character that I > increase the password by, an additional character is left off of the boot > option string. Once I reduce the password to a certain length (nine > characters in my case), there is enough space for all of the boot commands > to be entered, and the image is created successfully. I can't find anywhere > that indicates that there is a hard cap on the number of characters in the > boot options string, nor can I find any packer documentation that indicates > an internal length limitation. As a result, I'm not sure what the > underlying issue is, and could use some help if anyone has any suggestions. > > -- > This mailing list is governed under the HashiCorp Community Guidelines - > https://www.hashicorp.com/community-guidelines.html. Behavior in > violation of those guidelines may result in your removal from this mailing > list. > > GitHub Issues: https://github.com/mitchellh/packer/issues > IRC: #packer-tool on Freenode > --- > You received this message because you are subscribed to the Google Groups > "Packer" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to packer-tool+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/packer-tool/f84c5e9d-62aa-43eb-921f-ebd4ea29758a%40googlegroups.com > <https://groups.google.com/d/msgid/packer-tool/f84c5e9d-62aa-43eb-921f-ebd4ea29758a%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- This mailing list is governed under the HashiCorp Community Guidelines - https://www.hashicorp.com/community-guidelines.html. Behavior in violation of those guidelines may result in your removal from this mailing list. GitHub Issues: https://github.com/mitchellh/packer/issues IRC: #packer-tool on Freenode --- You received this message because you are subscribed to the Google Groups "Packer" group. To unsubscribe from this group and stop receiving emails from it, send an email to packer-tool+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/packer-tool/CALz9Rt9de_QxiicK6-%3DrehSf9pFhkEHhHr8ZiN3wm1%2Bt-VCNYA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
