You can grep through, the onlyi real function taht  uses it is 'rand_str'.
and i'm not sure really why that would be called at the point that you're
seeing the slow down.

I think it more valuable for you to figure out why your environment is
causing this issue and fixing that rather than fixing cloud-init (and
subsequently all users of entropy).

Also, information about how you've come across this bug would be good.

On Thu, Oct 26, 2017 at 11:24 AM, Steve Langasek <
<email address hidden>> wrote:

> On Thu, Oct 26, 2017 at 10:37:37AM -0000, Scott Moser wrote:
> > Only via 'import random' and light usage.
>
> Even "light" usage is going to block at this point in the boot; can you
> give
> me a pointer into where this is in the code, so I can try to assess if this
> should be avoided?
>
> --
> You received this bug notification because you are a member of Canonical
> Cloudware, which is subscribed to cloud-init.
> Matching subscriptions: cloud-init bugs
> https://bugs.launchpad.net/bugs/1727358
>
> Title:
>   cloud-init is slow to complete init on minimized images
>
> Status in cloud-init:
>   Incomplete
> Status in cloud-init package in Ubuntu:
>   Incomplete
>
> Bug description:
>   http://paste.ubuntu.com/25816789/ for the full logs.
>
>   cloud-init is very slow to complete its initialization steps.
>   Specifically, the 'init' takes over 150 seconds.
>
>   Cloud-init v. 17.1 running 'init-local' at Wed, 25 Oct 2017 13:22:07
> +0000. Up 2.39 seconds.
>   2017-10-25 13:22:07,157 - util.py[WARNING]: did not find either path
> /sys/class/dmi/id or dmidecode command
>   Cloud-init v. 17.1 running 'init' at Wed, 25 Oct 2017 13:22:16 +0000. Up
> 11.37 seconds.
>   ci-info: ++++++++++++++++++++++++++++++++Net device
> info+++++++++++++++++++++++++++++++++
>   ci-info: +--------+-------+-----------------+---------------+-------+
> -------------------+
>   ci-info: | Device |   Up  |     Address     |      Mask     | Scope |
>  Hw-Address    |
>   ci-info: +--------+-------+-----------------+---------------+-------+
> -------------------+
>   ci-info: | ens3:  |  True | 192.168.100.161 | 255.255.255.0 |   .   |
> 52:54:00:bb:ad:fb |
>   ci-info: | ens3:  |  True |        .        |       .       |   d   |
> 52:54:00:bb:ad:fb |
>   ci-info: |  lo:   |  True |    127.0.0.1    |   255.0.0.0   |   .   |
>      .         |
>   ci-info: |  lo:   |  True |        .        |       .       |   d   |
>      .         |
>   ci-info: | sit0:  | False |        .        |       .       |   .   |
>      .         |
>   ci-info: +--------+-------+-----------------+---------------+-------+
> -------------------+
>   ci-info: ++++++++++++++++++++++++++++++++Route IPv4
> info++++++++++++++++++++++++++++++++
>   ci-info: +-------+---------------+---------------+-----------------+-
> ----------+-------+
>   ci-info: | Route |  Destination  |    Gateway    |     Genmask     |
> Interface | Flags |
>   ci-info: +-------+---------------+---------------+-----------------+-
> ----------+-------+
>   ci-info: |   0   |    0.0.0.0    | 192.168.100.1 |     0.0.0.0     |
> ens3   |   UG  |
>   ci-info: |   1   | 192.168.100.0 |    0.0.0.0    |  255.255.255.0  |
> ens3   |   U   |
>   ci-info: |   2   | 192.168.100.1 |    0.0.0.0    | 255.255.255.255 |
> ens3   |   UH  |
>   ci-info: +-------+---------------+---------------+-----------------+-
> ----------+-------+
>   2017-10-25 13:24:38,187 - util.py[WARNING]: Failed to resize filesystem
> (cmd=('resize2fs', '/dev/root'))
>   2017-10-25 13:24:38,193 - util.py[WARNING]: Running module resizefs
> (<module 'cloudinit.config.cc_resizefs' from '/usr/lib/python3/dist-
> packages/cloudinit/config/cc_resizefs.py'>) failed
>   Generating public/private rsa key pair.
>   Your identification has been saved in /etc/ssh/ssh_host_rsa_key.
>   Your public key has been saved in /etc/ssh/ssh_host_rsa_key.pub.
>   The key fingerprint is:
>   SHA256:LKNlCqqOgPB8KBKGfPhFO5Rs6fDMnAvVet/W9i4vLxY root@cloudimg
>   The key's randomart image is:
>   +---[RSA 2048]----+
>   |                 |
>   |    . +          |
>   |   . O .         |
>   |o . % +.         |
>   |++.o %=.S        |
>   |+=ooo=+o. . .E   |
>   |* +.+.   . o o.  |
>   |=. .      . .=.  |
>   |+.          . B= |
>   +----[SHA256]-----+
>   Generating public/private dsa key pair.
>   Your identification has been saved in /etc/ssh/ssh_host_dsa_key.
>   Your public key has been saved in /etc/ssh/ssh_host_dsa_key.pub.
>   The key fingerprint is:
>   SHA256:dNWNyBHqTUCl820/vL0dEhOVDFYJzqr1WeuqV1PAmjk root@cloudimg
>   The key's randomart image is:
>   +---[DSA 1024]----+
>   |         .oo=X==o|
>   |           =* *+.|
>   |        . = .B . |
>   |       . o =E.. .|
>   |        S .oo+o..|
>   |          o ..*+.|
>   |         .   +.=o|
>   |             .o *|
>   |           .o..++|
>   +----[SHA256]-----+
>   Generating public/private ecdsa key pair.
>   Your identification has been saved in /etc/ssh/ssh_host_ecdsa_key.
>   Your public key has been saved in /etc/ssh/ssh_host_ecdsa_key.pub.
>   The key fingerprint is:
>   SHA256:N3RTlPa7KU5ryq6kJAO8Tiq90ub4P1DGSofn6jFkM3k root@cloudimg
>   The key's randomart image is:
>   +---[ECDSA 256]---+
>   |             .o. |
>   |             .o  |
>   |   o      . o. . |
>   |  +.*    . . .  .|
>   | .*XE   S o     .|
>   | oo++    . .   . |
>   | oo= o . .   .  o|
>   |o.Oo. + o . .o.o |
>   |oB=+.. . .o++o.  |
>   +----[SHA256]-----+
>   Generating public/private ed25519 key pair.
>   Your identification has been saved in /etc/ssh/ssh_host_ed25519_key.
>   Your public key has been saved in /etc/ssh/ssh_host_ed25519_key.pub.
>   The key fingerprint is:
>   SHA256:B6B/1SyUB/TFPfmU1ADIotnD+wjISO5L2JZkWe2lDUA root@cloudimg
>   The key's randomart image is:
>   +--[ED25519 256]--+
>   |   .E .  o++.o+++|
>   |     + ...++...++|
>   |    o o=o.o.+  .o|
>   |  .o oo=+o .    .|
>   | o+o .+ So.      |
>   | =o.o ....       |
>   |..=    . o       |
>   | o.     . .      |
>   |  ..             |
>   +----[SHA256]-----+
>   sudo: unable to resolve host cloudimg: Resource temporarily unavailable
>   Cloud-init v. 17.1 running 'modules:config' at Wed, 25 Oct 2017 13:24:39
> +0000. Up 155.13 seconds.
>   2017-10-25 13:24:40,289 - util.py[WARNING]: Failed to run command to
> import ubuntu ssh ids
>   2017-10-25 13:24:40,291 - util.py[WARNING]: ssh-import-id failed for:
> ubuntu ['cyphermox']
>   2017-10-25 13:24:40,292 - util.py[WARNING]: Running module ssh-import-id
> (<module 'cloudinit.config.cc_ssh_import_id' from '/usr/lib/python3/dist-
> packages/cloudinit/config/cc_ssh_import_id.py'>) failed
>   Cloud-init v. 17.1 running 'modules:final' at Wed, 25 Oct 2017 13:24:41
> +0000. Up 156.51 seconds.
>   ci-info: no authorized ssh keys fingerprints found for user ubuntu.
>   Cloud-init v. 17.1 finished at Wed, 25 Oct 2017 13:24:41 +0000.
> Datasource DataSourceNoCloud [seed=/dev/vdb][dsmode=net].  Up 156.83 seconds
>
>
>   This does not seem to be caused by ssh key generation (I tried to
> disable it, with no keytypes enabled there is still > 150 s delay), not
> does it seem to be related to the resizing operation.
>
>   I suspect some other step requiring randomness to generate some kind
>   of ID, but I don't know.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/cloud-init/+bug/1727358/+subscriptions
>
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