20210309: Ubuntu 20.04.2 LTS - snap の download が遅い

状況

Flutter 2 を使ってみようかと思い、

Flutter / Get Started / Install / Linux install

に従い、

$ sudo snap install flutter --classic

ってやってみたんだが、死にそうに遅い。

$ sudo snap install flutter --classic
Download snap "flutter" (50) from channel "stable" 31% 53.2kB/s 45.1m

みたいな感じで 53.2kB/s しか出てなくて45分かかるとか、は？これどこの 56k モデムか？って状況。
高速なミラーとか選択できないの？これ？

解決方法

「linux snap install too slow」でググったら以下のページを見つけた。

snapcraft / 2018-03-18: Extremely slow snap downloads
StackExchange / ask ubuntu / 2019-08-09: Installing Snaps in China is too slow
UbuntuHandbook / Howtos / 2019-11-26: [Quick Tip] Speed Up Installing (Downloading) Snap App in Ubuntu

結論から言うと、dig か nslookup で fastly.cdn.snapcraft.io が引けるか確認して、引けなかったら、/etc/hosts に

151.101.62.217  fastly.cdn.snapcraft.io

って書き加えとけというアドバイスがビンゴ。9.6MB/s で無事瞬殺。
って言うか、何で引けないんだよ？これ？

他には、

https://status.snapcraft.io/

見ると、snapcraft のサーバーが落ちてないか確認できるとの事。
こちらは問題なかった。

因みに、

snapcraft / 2018-03-18: Extremely slow snap downloads # comment 16

に診断スクリプトあったので確認してみたが
fastly.cdn.snapcraft.io 引けてるときは

[20210309_223114] kou@H97GAMING3(x86_64): /tmp
$ SNAPD_DEBUG=1 SNAPD_DEBUG_HTTP=9 snap download flutter
2021/03/09 22:31:22.756259 tool_linux.go:204: DEBUG: restarting into "/snap/snapd/current/usr/bin/snap"
Fetching snap "flutter"
2021/03/09 22:31:22.766550 helpers.go:287: DEBUG: Going to download snap "flutter" in "/tmp".
2021/03/09 22:31:22.766730 store_action.go:441: DEBUG: Deltas enabled. Adding header Snap-Accept-Delta-Format: xdelta3
2021/03/09 22:31:22.766762 retry.go:49: DEBUG: Retrying https://api.snapcraft.io/v2/snaps/refresh, attempt 1, elapsed time=2.961&#181;s
2021/03/09 22:31:22.766779 store.go:929: DEBUG: cannot set device session: no device serial yet
2021/03/09 22:31:22.767009 logger.go:67: DEBUG: > "POST /v2/snaps/refresh HTTP/1.1\r\nHost: api.snapcraft.io\r\nUser-Agent: snapd/2.49 (series 16; classic) snap ubuntu/20.04 (amd64) linux/5.4.0-58-generic\r\nContent-Length: 369\r\nAccept: application/json\r\nContent-Type: application/json\r\nSnap-Accept-Delta-Format: xdelta3\r\nSnap-Classic: true\r\nSnap-Device-Architecture: amd64\r\nSnap-Device-Capabilities: default-tracks\r\nSnap-Device-Series: 16\r\nAccept-Encoding: gzip\r\n\r\n"
2021/03/09 22:31:23.959391 retry.go:61: DEBUG: The retry loop for https://api.snapcraft.io/v2/snaps/refresh finished after 1 retries, elapsed time=1.192641599s, status: 200
2021/03/09 22:31:23.959713 store_download.go:161: DEBUG: Available deltas returned by store: []
2021/03/09 22:31:23.959880 store_download.go:197: DEBUG: Starting download of "/tmp/flutter_50.snap.partial".
2021/03/09 22:31:23.959900 retry.go:49: DEBUG: Retrying https://api.snapcraft.io/api/v1/snaps/download/YO0Adf4fqgxL7i3SaCn00oxEfd5CNQ63_50.snap, attempt 1, elapsed time=4.56&#181;s
2021/03/09 22:31:23.959913 store.go:929: DEBUG: cannot set device session: no device serial yet
2021/03/09 22:31:23.960061 logger.go:67: DEBUG: > "GET /api/v1/snaps/download/YO0Adf4fqgxL7i3SaCn00oxEfd5CNQ63_50.snap HTTP/1.1\r\nHost: api.snapcraft.io\r\nUser-Agent: snapd/2.49 (series 16; classic) snap ubuntu/20.04 (amd64) linux/5.4.0-58-generic\r\nAccept: \r\nSnap-Device-Capabilities: default-tracks\r\nX-Ubuntu-Architecture: amd64\r\nX-Ubuntu-Classic: true\r\nX-Ubuntu-Series: 16\r\nX-Ubuntu-Wire-Protocol: 1\r\nAccept-Encoding: gzip\r\n\r\n"
2021/03/09 22:31:25.252135 logger.go:67: DEBUG: > "GET /download-origin/canonical-lgw01/YO0Adf4fqgxL7i3SaCn00oxEfd5CNQ63_50.snap?token=1615309200_c8fa87dae06d78d6bcc4f6b3a4e280447815a572 HTTP/1.1\r\nHost: canonical-bos01.cdn.snapcraft.io\r\nUser-Agent: snapd/2.49 (series 16; classic) snap ubuntu/20.04 (amd64) linux/5.4.0-58-generic\r\nAccept: \r\nReferer: https://api.snapcraft.io/api/v1/snaps/download/YO0Adf4fqgxL7i3SaCn00oxEfd5CNQ63_50.snap\r\nSnap-Device-Capabilities: default-tracks\r\nX-Ubuntu-Architecture: amd64\r\nX-Ubuntu-Classic: true\r\nX-Ubuntu-Series: 16\r\nX-Ubuntu-Wire-Protocol: 1\r\nAccept-Encoding: gzip\r\n\r\n"
2021/03/09 22:31:48.076787 store_download.go:532: DEBUG: Download succeeded in 24.117s (9MB/s).
Fetching assertions for "flutter"
2021/03/09 22:31:48.993579 retry.go:49: DEBUG: Retrying https://api.snapcraft.io/api/v1/snaps/assertions/snap-revision/ZmVyKHgJGuI3txejYy7UL_hFXOnK_n60hAsLgo6gW_UveECAgSpw7lNKzPp1D9gs?max-format=0, attempt 1, elapsed time=4.584&#181;s
2021/03/09 22:31:48.993606 store.go:929: DEBUG: cannot set device session: no device serial yet
2021/03/09 22:31:48.993783 logger.go:67: DEBUG: > "GET /api/v1/snaps/assertions/snap-revision/ZmVyKHgJGuI3txejYy7UL_hFXOnK_n60hAsLgo6gW_UveECAgSpw7lNKzPp1D9gs?max-format=0 HTTP/1.1\r\nHost: api.snapcraft.io\r\nUser-Agent: snapd/2.49 (series 16; classic) snap ubuntu/20.04 (amd64) linux/5.4.0-58-generic\r\nAccept: application/x.ubuntu.assertion\r\nSnap-Device-Capabilities: default-tracks\r\nX-Ubuntu-Architecture: amd64\r\nX-Ubuntu-Classic: true\r\nX-Ubuntu-Series: 16\r\nX-Ubuntu-Wire-Protocol: 1\r\nAccept-Encoding: gzip\r\n\r\n"
2021/03/09 22:31:50.050713 retry.go:61: DEBUG: The retry loop for https://api.snapcraft.io/api/v1/snaps/assertions/snap-revision/ZmVyKHgJGuI3txejYy7UL_hFXOnK_n60hAsLgo6gW_UveECAgSpw7lNKzPp1D9gs?max-format=0 finished after 1 retries, elapsed time=1.05713479s, status: 200
2021/03/09 22:31:50.050754 retry.go:49: DEBUG: Retrying https://api.snapcraft.io/api/v1/snaps/assertions/snap-declaration/16/YO0Adf4fqgxL7i3SaCn00oxEfd5CNQ63?max-format=4, attempt 1, elapsed time=1.99&#181;s
2021/03/09 22:31:50.050768 store.go:929: DEBUG: cannot set device session: no device serial yet
2021/03/09 22:31:50.050894 logger.go:67: DEBUG: > "GET /api/v1/snaps/assertions/snap-declaration/16/YO0Adf4fqgxL7i3SaCn00oxEfd5CNQ63?max-format=4 HTTP/1.1\r\nHost: api.snapcraft.io\r\nUser-Agent: snapd/2.49 (series 16; classic) snap ubuntu/20.04 (amd64) linux/5.4.0-58-generic\r\nAccept: application/x.ubuntu.assertion\r\nSnap-Device-Capabilities: default-tracks\r\nX-Ubuntu-Architecture: amd64\r\nX-Ubuntu-Classic: true\r\nX-Ubuntu-Series: 16\r\nX-Ubuntu-Wire-Protocol: 1\r\nAccept-Encoding: gzip\r\n\r\n"
2021/03/09 22:31:50.327013 retry.go:61: DEBUG: The retry loop for https://api.snapcraft.io/api/v1/snaps/assertions/snap-declaration/16/YO0Adf4fqgxL7i3SaCn00oxEfd5CNQ63?max-format=4 finished after 1 retries, elapsed time=276.259638ms, status: 200
2021/03/09 22:31:50.327062 retry.go:49: DEBUG: Retrying https://api.snapcraft.io/api/v1/snaps/assertions/account/31hpowUutr6Jgcqx1cjBTEnKAbM1La5H?max-format=0, attempt 1, elapsed time=2.446&#181;s
2021/03/09 22:31:50.327078 store.go:929: DEBUG: cannot set device session: no device serial yet
2021/03/09 22:31:50.327200 logger.go:67: DEBUG: > "GET /api/v1/snaps/assertions/account/31hpowUutr6Jgcqx1cjBTEnKAbM1La5H?max-format=0 HTTP/1.1\r\nHost: api.snapcraft.io\r\nUser-Agent: snapd/2.49 (series 16; classic) snap ubuntu/20.04 (amd64) linux/5.4.0-58-generic\r\nAccept: application/x.ubuntu.assertion\r\nSnap-Device-Capabilities: default-tracks\r\nX-Ubuntu-Architecture: amd64\r\nX-Ubuntu-Classic: true\r\nX-Ubuntu-Series: 16\r\nX-Ubuntu-Wire-Protocol: 1\r\nAccept-Encoding: gzip\r\n\r\n"
2021/03/09 22:31:50.584958 retry.go:61: DEBUG: The retry loop for https://api.snapcraft.io/api/v1/snaps/assertions/account/31hpowUutr6Jgcqx1cjBTEnKAbM1La5H?max-format=0 finished after 1 retries, elapsed time=257.892891ms, status: 200
2021/03/09 22:31:50.585008 retry.go:49: DEBUG: Retrying https://api.snapcraft.io/api/v1/snaps/assertions/account-key/BWDEoaqyr25nF5SNCvEv2v7QnM9QsfCc0PBMYD_i2NGSQ32EF2d4D0hqUel3m8ul?max-format=0, attempt 1, elapsed time=3.282&#181;s
2021/03/09 22:31:50.585031 store.go:929: DEBUG: cannot set device session: no device serial yet
2021/03/09 22:31:50.585166 logger.go:67: DEBUG: > "GET /api/v1/snaps/assertions/account-key/BWDEoaqyr25nF5SNCvEv2v7QnM9QsfCc0PBMYD_i2NGSQ32EF2d4D0hqUel3m8ul?max-format=0 HTTP/1.1\r\nHost: api.snapcraft.io\r\nUser-Agent: snapd/2.49 (series 16; classic) snap ubuntu/20.04 (amd64) linux/5.4.0-58-generic\r\nAccept: application/x.ubuntu.assertion\r\nSnap-Device-Capabilities: default-tracks\r\nX-Ubuntu-Architecture: amd64\r\nX-Ubuntu-Classic: true\r\nX-Ubuntu-Series: 16\r\nX-Ubuntu-Wire-Protocol: 1\r\nAccept-Encoding: gzip\r\n\r\n"
2021/03/09 22:31:50.832999 retry.go:61: DEBUG: The retry loop for https://api.snapcraft.io/api/v1/snaps/assertions/account-key/BWDEoaqyr25nF5SNCvEv2v7QnM9QsfCc0PBMYD_i2NGSQ32EF2d4D0hqUel3m8ul?max-format=0 finished after 1 retries, elapsed time=247.988221ms, status: 200
Install the snap with:
   snap ack flutter_50.assert
   snap install flutter_50.snap
[20210309_223150] kou@H97GAMING3(x86_64): /tmp
$

引けてないときは

[20210309_223224] kou@H97GAMING3(x86_64): /tmp
$ SNAPD_DEBUG=1 SNAPD_DEBUG_HTTP=9 snap download flutter
2021/03/09 22:32:27.287466 tool_linux.go:204: DEBUG: restarting into "/snap/snapd/current/usr/bin/snap"
Fetching snap "flutter"
2021/03/09 22:32:27.297511 helpers.go:287: DEBUG: Going to download snap "flutter" in "/tmp".
2021/03/09 22:32:27.297724 store_action.go:441: DEBUG: Deltas enabled. Adding header Snap-Accept-Delta-Format: xdelta3
2021/03/09 22:32:27.297756 retry.go:49: DEBUG: Retrying https://api.snapcraft.io/v2/snaps/refresh, attempt 1, elapsed time=2.415&#181;s
2021/03/09 22:32:27.297770 store.go:929: DEBUG: cannot set device session: no device serial yet
2021/03/09 22:32:27.297957 logger.go:67: DEBUG: > "POST /v2/snaps/refresh HTTP/1.1\r\nHost: api.snapcraft.io\r\nUser-Agent: snapd/2.49 (series 16; classic) snap ubuntu/20.04 (amd64) linux/5.4.0-58-generic\r\nContent-Length: 369\r\nAccept: application/json\r\nContent-Type: application/json\r\nSnap-Accept-Delta-Format: xdelta3\r\nSnap-Classic: true\r\nSnap-Device-Architecture: amd64\r\nSnap-Device-Capabilities: default-tracks\r\nSnap-Device-Series: 16\r\nAccept-Encoding: gzip\r\n\r\n"
2021/03/09 22:32:28.495313 retry.go:61: DEBUG: The retry loop for https://api.snapcraft.io/v2/snaps/refresh finished after 1 retries, elapsed time=1.197567577s, status: 200
2021/03/09 22:32:28.495607 store_download.go:161: DEBUG: Available deltas returned by store: []
2021/03/09 22:32:28.495779 store_download.go:197: DEBUG: Starting download of "/tmp/flutter_50.snap.partial".
2021/03/09 22:32:28.495813 retry.go:49: DEBUG: Retrying https://api.snapcraft.io/api/v1/snaps/download/YO0Adf4fqgxL7i3SaCn00oxEfd5CNQ63_50.snap, attempt 1, elapsed time=15.854&#181;s
2021/03/09 22:32:28.495839 store.go:929: DEBUG: cannot set device session: no device serial yet
2021/03/09 22:32:28.496032 logger.go:67: DEBUG: > "GET /api/v1/snaps/download/YO0Adf4fqgxL7i3SaCn00oxEfd5CNQ63_50.snap HTTP/1.1\r\nHost: api.snapcraft.io\r\nUser-Agent: snapd/2.49 (series 16; classic) snap ubuntu/20.04 (amd64) linux/5.4.0-58-generic\r\nAccept: \r\nSnap-Device-Capabilities: default-tracks\r\nX-Ubuntu-Architecture: amd64\r\nX-Ubuntu-Classic: true\r\nX-Ubuntu-Series: 16\r\nX-Ubuntu-Wire-Protocol: 1\r\nAccept-Encoding: gzip\r\n\r\n"
2021/03/09 22:32:29.691327 logger.go:67: DEBUG: > "GET /download-origin/canonical-lgw01/YO0Adf4fqgxL7i3SaCn00oxEfd5CNQ63_50.snap?token=1615309200_c8fa87dae06d78d6bcc4f6b3a4e280447815a572 HTTP/1.1\r\nHost: canonical-bos01.cdn.snapcraft.io\r\nUser-Agent: snapd/2.49 (series 16; classic) snap ubuntu/20.04 (amd64) linux/5.4.0-58-generic\r\nAccept: \r\nReferer: https://api.snapcraft.io/api/v1/snaps/download/YO0Adf4fqgxL7i3SaCn00oxEfd5CNQ63_50.snap\r\nSnap-Device-Capabilities: default-tracks\r\nX-Ubuntu-Architecture: amd64\r\nX-Ubuntu-Classic: true\r\nX-Ubuntu-Series: 16\r\nX-Ubuntu-Wire-Protocol: 1\r\nAccept-Encoding: gzip\r\n\r\n"
flutter                                                        4%  155kB/s 21.3m
^C
[20210309_223327] kou@H97GAMING3(x86_64): /tmp
$

みたいな感じになる。
ぱっと見つぅか、diff 取ってもタイムスタンプ以外の違いが見当たらない。
どの CDN 使ってるのかはどうやって確認すればよいのだろうか？？？

mtr はよくわからんのだが、
fastly.cdn.snapcraft.io 引けてる時

$ mtr --report-wide api.snapcraft.io
Start: 2021-03-09T22:27:13+0900
HOST: H97GAMING3                             Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- 192.168.1.1                             0.0%    10    0.5   0.5   0.4   0.6   0.1
  2.|-- ***.**.**.***                           0.0%    10   28.4  29.8   2.5  42.7  14.4
  3.|-- ***.**.**.***                           0.0%    10   24.0  28.5   2.1  46.3  16.3
  4.|-- ***.**.**.***                           0.0%    10   32.6  43.0   4.1  93.7  22.9
  5.|-- ***.**.**.***                           0.0%    10   25.0  34.2   6.0  47.6  13.0
  6.|-- 125.170.96.53                           0.0%    10   38.8  42.8  13.4  55.9  14.0
  7.|-- 125.170.96.34                           0.0%    10   57.5  42.0  16.0  60.0  18.6
  8.|-- ae-17.r03.osakjp02.jp.bb.gin.ntt.net    0.0%    10   55.6  40.8  19.6  59.9  16.1
  9.|-- ae-2.r25.osakjp02.jp.bb.gin.ntt.net     0.0%    10   52.2  38.8  21.8  60.2  14.6
 10.|-- ae-3.r24.lsanca07.us.bb.gin.ntt.net     0.0%    10  132.2 146.3 124.8 167.0  16.2
 11.|-- ae-1.r00.lsanca07.us.bb.gin.ntt.net     0.0%    10  128.3 145.2 122.4 160.8  13.0
 12.|-- ae-0.level3.lsanca07.us.bb.gin.ntt.net 90.0%    10  150.1 150.1 150.1 150.1   0.0
 13.|-- ???                                    100.0    10    0.0   0.0   0.0   0.0   0.0
 14.|-- SOURCE-MANA.ear2.London1.Level3.net     0.0%    10  329.4 309.9 281.6 369.5  25.6
 15.|-- te2-1.tigermelon.canonical.com          0.0%    10  266.0 271.7 250.8 289.0  12.1
 16.|-- zeeman.canonical.com                   10.0%    10  291.1 294.5 268.7 309.9  11.9
 17.|-- api.snapcraft.io                       10.0%    10  283.4 276.8 247.9 292.0  13.8

引けてない時

$ mtr --report-wide api.snapcraft.io
Start: 2021-03-09T22:42:44+0900
HOST: H97GAMING3                             Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- 192.168.1.1                             0.0%    10    0.5   0.5   0.4   0.7   0.1
  2.|-- ***.**.**.***                           0.0%    10   15.9  10.9   1.9  35.2  11.0
  3.|-- ***.**.**.***                           0.0%    10    8.9   9.6   1.9  35.2  13.2
  4.|-- ***.**.**.***                           0.0%    10   20.3  11.6   4.5  28.3   9.3
  5.|-- ***.**.**.***                           0.0%    10   12.4  12.0   5.4  36.9   9.7
  6.|-- 153.149.219.45                          0.0%    10   18.5  19.2   8.8  49.0  12.5
  7.|-- 153.149.219.146                         0.0%    10   35.3  23.1   9.9  46.3  11.5
  8.|-- ae-12.r02.osakjp02.jp.bb.gin.ntt.net    0.0%    10   28.1  23.9  12.2  40.5   8.6
  9.|-- ae-3.r25.osakjp02.jp.bb.gin.ntt.net     0.0%    10   26.4  27.4  12.5  52.6  11.9
 10.|-- ae-3.r24.lsanca07.us.bb.gin.ntt.net     0.0%    10  137.4 138.6 122.2 170.6  16.4
 11.|-- ae-1.r00.lsanca07.us.bb.gin.ntt.net     0.0%    10  127.7 130.0 117.6 158.7  13.0
 12.|-- ae-0.level3.lsanca07.us.bb.gin.ntt.net 90.0%    10  120.7 120.7 120.7 120.7   0.0
 13.|-- ???                                    100.0    10    0.0   0.0   0.0   0.0   0.0
 14.|-- SOURCE-MANA.ear2.London1.Level3.net     0.0%    10  272.1 279.7 268.1 307.7  13.2
 15.|-- te2-1.tigermelon.canonical.com          0.0%    10  240.5 251.1 240.5 275.9  11.8
 16.|-- zeeman.canonical.com                    0.0%    10  266.2 270.3 263.3 292.8  11.9
 17.|-- api.snapcraft.io                        0.0%    10  262.8 269.2 262.7 288.1   9.0

みたいな感じ。
API サーバーじゃなく CDN サーバーの問題っぽいので、この診断じゃ何もわからんっぽい。

このページを編集するこのページを元に新規ページを作成

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20210309: Ubuntu 20.04.2 LTS - snap の download が遅い - PIB 先頭へ

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