HTTP/2 support not enabled (install the http2 and tls Twisted extras).

Question

I created the Azure web app container service. Where I am trying to build redis image along with private Django channels image. I am getting the below error and the container is stopping. These are my logs in the web app container.

2020-07-08T01:24:20.575Z ERROR - multi-container unit was not started successfully
2020-07-08T01:24:20.585Z INFO - Container logs from kiwi-message-delivery_redis_0_530c2465 = 2020-07-08T01:20:34.613961396Z 1:C 08 Jul 2020 01:20:34.613 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
2020-07-08T01:20:34.622739022Z 1:C 08 Jul 2020 01:20:34.622 # Redis version=6.0.5, bits=64, commit=00000000, modified=0, pid=1, just started
2020-07-08T01:20:34.623124845Z 1:C 08 Jul 2020 01:20:34.622 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
2020-07-08T01:20:34.708013928Z 1:M 08 Jul 2020 01:20:34.707 * Running mode=standalone, port=6379.
2020-07-08T01:20:34.708440853Z 1:M 08 Jul 2020 01:20:34.708 # Server initialized
2020-07-08T01:20:34.708763573Z 1:M 08 Jul 2020 01:20:34.708 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
2020-07-08T01:20:34.709083492Z 1:M 08 Jul 2020 01:20:34.708 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.
2020-07-08T01:20:34.709659826Z 1:M 08 Jul 2020 01:20:34.709 * Ready to accept connections
2020-07-08T01:20:37.186901553Z 1:M 08 Jul 2020 01:20:37.186 # Possible SECURITY ATTACK detected. It looks like somebody is sending POST or Host: commands to Redis. This is likely due to an attacker attempting to use Cross Protocol Scripting to compromise your Redis instance. Connection aborted.
2020-07-08T01:21:38.792293857Z 1:M 08 Jul 2020 01:21:38.792 # Possible SECURITY ATTACK detected. It looks like somebody is sending POST or Host: commands to Redis. This is likely due to an attacker attempting to use Cross Protocol Scripting to compromise your Redis instance. Connection aborted.
2020-07-08T01:22:39.333304667Z 1:M 08 Jul 2020 01:22:39.333 # Possible SECURITY ATTACK detected. It looks like somebody is sending POST or Host: commands to Redis. This is likely due to an attacker attempting to use Cross Protocol Scripting to compromise your Redis instance. Connection aborted.
2020-07-08T01:23:40.870740206Z 1:M 08 Jul 2020 01:23:40.870 # Possible SECURITY ATTACK detected. It looks like somebody is sending POST or Host: commands to Redis. This is likely due to an attacker attempting to use Cross Protocol Scripting to compromise your Redis instance. Connection aborted.

2020-07-08T01:24:24.447Z INFO - Container logs from kiwi-message-delivery_channels_0_530c2465 = 2020-07-08T01:20:43.833567596Z 2020-07-08 01:20:43,832 INFO Starting server at tcp:port=8000:interface=0.0.0.0
2020-07-08T01:20:43.834721057Z 2020-07-08 01:20:43,834 INFO HTTP/2 support not enabled (install the http2 and tls Twisted extras)
2020-07-08T01:20:43.841353805Z 2020-07-08 01:20:43,840 INFO Configuring endpoint tcp:port=8000:interface=0.0.0.0
2020-07-08T01:20:43.843852936Z 2020-07-08 01:20:43,843 INFO Listening on TCP address 0.0.0.0:8000

2020-07-08T01:24:29.155Z INFO - Stopping site kiwi-message-delivery because it failed during startup.

I tried with enabling the HTTP 2.0 in Web App configuration. But not working.

Anyone please help me with this.

Answer 1

Hello @santhoshk-7720 , The message

HTTP/2 support not enabled (install the http2 and tls Twisted extras)

is not really an error. It's INFO. Though you can follow https://github.com/django/daphne#http2-support to get rid of that, but not required.

The error seems to be because of startup error

2020-07-08T01:24:20.575Z ERROR - multi-container unit was not started successfully.

You need to look for logs before it to find the real cause.

Also, you might want to fix the other warnings of redis related to memory configs.