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Web Interface Inaccessible

Tags: #<Tag:0x00007f6e05291c68>

I have an emonpi that has been working perfectly since I bought it a few months ago. All of a sudden the web interface is very slow or not accessible at all.

I can SSH into the unit and run top, the output is below, but when I do Ctrl + C the putty session hangs.

Any ideas?

top - 21:48:11 up 19 min,  1 user,  load average: 0.00, 0.08, 0.12
Tasks: 114 total,   1 running, 113 sleeping,   0 stopped,   0 zombie
%Cpu(s):  2.4 us,  0.8 sy,  0.0 ni, 96.7 id,  0.0 wa,  0.0 hi,  0.1 si,  0.0 st
MiB Mem :    975.6 total,    568.0 free,    162.4 used,    245.2 buff/cache
MiB Swap:    100.0 total,    100.0 free,      0.0 used.    712.2 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
  364 emonhub   20   0   54412  18744   7336 S   6.0   1.9   1:00.51 python3
  539 redis     20   0   45640   4192   2896 S   2.3   0.4   0:17.76 redis-server
  634 root      20   0   80500  22316  17304 S   2.0   2.2   0:11.33 php
  493 root      20   0   61248  17460   6664 S   1.0   1.7   0:13.86 python
  561 pi        20   0   17912  10696   6200 S   1.0   1.1   0:11.61 python
  983 pi        20   0   10328   2884   2448 R   1.0   0.3   0:00.07 top
  962 www-data  20   0  213844  16376  11248 S   0.7   1.6   0:00.16 apache2
   10 root      20   0       0      0      0 I   0.0   0.0   0:01.77 rcu_sched
   11 root      20   0       0      0      0 I   0.0   0.0   0:00.00 rcu_bh
   12 root      rt   0       0      0      0 S   0.0   0.0   0:00.00 migration/0
   13 root      20   0       0      0      0 S   0.0   0.0   0:00.00 cpuhp/0
   14 root      20   0       0      0      0 S   0.0   0.0   0:00.00 cpuhp/1
   15 root      rt   0       0      0      0 S   0.0   0.0   0:00.00 migration/1
   16 root      20   0       0      0      0 S   0.0   0.0   0:00.06 ksoftirqd/1
   19 root      20   0       0      0      0 S   0.0   0.0   0:00.00 cpuhp/2
   20 root      rt   0       0      0      0 S   0.0   0.0   0:00.00 migration/2
   21 root      20   0       0      0      0 S   0.0   0.0   0:00.07 ksoftirqd/2
   23 root       0 -20       0      0      0 I   0.0   0.0   0:00.12 kworker/2:0H-kblockd
   24 root      20   0       0      0      0 S   0.0   0.0   0:00.00 cpuhp/3
   25 root      rt   0       0      0      0 S   0.0   0.0   0:00.00 migration/3
   26 root      20   0       0      0      0 S   0.0   0.0   0:00.08 ksoftirqd/3
   29 root      20   0       0      0      0 S   0.0   0.0   0:00.00 kdevtmpfs
   30 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 netns
   31 root      20   0       0      0      0 I   0.0   0.0   0:00.81 kworker/0:1-events
   32 root      20   0       0      0      0 I   0.0   0.0   0:00.15 kworker/1:1-events
   33 root      20   0       0      0      0 I   0.0   0.0   0:00.12 kworker/2:1-memcg_kmem_cache
   34 root      20   0       0      0      0 S   0.0   0.0   0:00.00 khungtaskd
   35 root      20   0       0      0      0 S   0.0   0.0   0:00.00 oom_reaper
   36 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 writeback
   37 root      20   0       0      0      0 S   0.0   0.0   0:00.00 kcompactd0
   38 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 crypto
   39 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 kblockd
   40 root      rt   0       0      0      0 S   0.0   0.0   0:00.00 watchdogd
   41 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 rpciod
   42 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 kworker/u9:0
   43 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 xprtiod
   46 root      20   0       0      0      0 S   0.0   0.0   0:00.00 kswapd0
   47 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nfsiod
   58 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 kthrotld
   60 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 iscsi_eh
   61 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 dwc_otg
   62 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 DWC Notificatio
   63 root       1 -19       0      0      0 S   0.0   0.0   0:00.00 vchiq-slot/0
   64 root       1 -19       0      0      0 S   0.0   0.0   0:00.00 vchiq-recy/0
   65 root       0 -20       0      0      0 S   0.0   0.0   0:00.00 vchiq-sync/0
   66 root      20   0       0      0      0 S   0.0   0.0   0:00.00 vchiq-keep/0
   67 root      20   0       0      0      0 I   0.0   0.0   0:00.05 kworker/3:2-events
   68 root     -51   0       0      0      0 S   0.0   0.0   0:00.82 irq/86-mmc1
   71 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 mmc_complete
   72 root       0 -20       0      0      0 I   0.0   0.0   0:00.10 kworker/3:1H-kblockd
   73 root       0 -20       0      0      0 I   0.0   0.0   0:00.24 kworker/0:1H-mmc_complete
   74 root       0 -20       0      0      0 I   0.0   0.0   0:00.20 kworker/1:1H-kblockd
   75 root      20   0       0      0      0 S   0.0   0.0   0:00.00 jbd2/mmcblk0p2-
   76 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 ext4-rsv-conver
   78 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 ipv6_addrconf

Try

df -h

Search for ‘/var/log’ filling up here.

Disk space was my first thought but it’s got plenty remaining.

It seems to be working this morning. I’ll keep an eye on it.

It is still very slow however. Where should I start to diagnose this?

Please paste the output.

Here you go:

[email protected]:~ $ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/root       4.0G  2.1G  1.7G  56% /
devtmpfs        484M     0  484M   0% /dev
tmpfs           488M     0  488M   0% /dev/shm
tmpfs           488M  6.5M  482M   2% /run
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs           488M     0  488M   0% /sys/fs/cgrouptmpfs           1.0M     0  1.0M   0% /var/tmp
tmpfs            30M     0   30M   0% /tmp
tmpfs           1.0M     0  1.0M   0% /var/lib/php/sessions
/dev/mmcblk0p3   10G   53M  9.5G   1% /var/opt/emoncms
/dev/mmcblk0p1  253M   52M  201M  21% /boot
log2ram          50M   38M   13M  75% /var/log
tmpfs            98M     0   98M   0% /run/user/1000

This looks rather full. follow this

Given that your load average looks plenty low enough and the SD card is not full. Another possibility is some kind of sd card corruption after a power cut affecting another part of the system. I appreciate that its a pain to do, but if nothing else comes to mind you could try the “Upgrade to a new SD card” section here https://guide.openenergymonitor.org/setup/update/#upgrading-to-a-new-emonsd-image

Thanks @TrystanLea but we’ve not had a power cut. The unit is not that old.
I’ve tested the performance of the SD card and it’s very quick. It is a very strange issue.

Thanks @maximundo Im not sure how to solve unfortunately, we’d be happy to send a replacement SD card for you to try, if you email us at [email protected] we can get that sorted for you.

Thanks for the offer @TrystanLea but no need. I’ve found the problem to be the Wi-Fi connection. It must have been a coincidence that when I was checking the Wi-Fi it was useable but slow. This evening it didn’t work at all. It has been fine for weeks which I’ve changed nothing!

Resorted to using a HomePlug and ethernet cable. Its now quick as a flash!

Thanks

2 Likes

Great to hear @maximundo