At the time of making Docker, this gives an error

[enghamid]

[root@kai mtprotoproxy]# docker-compose up -d
Building mtprotoproxy Step 1/9 : FROM alpine:3.10 ---> af341ccd2df8 Step 2/9 : RUN adduser tgproxy -u 10000 -D ---> Running in 7f2c79f1ac00 Removing intermediate container 7f2c79f1ac00 ---> f394f643b8e4 Step 3/9 : RUN apk add --no-cache python3 py3-cryptography ca-certificates libcap ---> Running in 762953aefa44 fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/main/x86_64/APKINDEX.tar.gz fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/community/x86_64/APKINDEX.tar.gz WARNING: Ignoring http://dl-cdn.alpinelinux.org/alpine/v3.10/main/x86_64/APKINDEX.tar.gz: temporary error (try again later) WARNING: Ignoring http://dl-cdn.alpinelinux.org/alpine/v3.10/community/x86_64/APKINDEX.tar.gz: temporary error (try again later) ERROR: unsatisfiable constraints: ca-certificates (missing): required by: world[ca-certificates] libcap (missing): required by: world[libcap] py3-cryptography (missing): required by: world[py3-cryptography] python3 (missing): required by: world[python3] ERROR: Service 'mtprotoproxy' failed to build: The command '/bin/sh -c apk add --no-cache python3 py3-cryptography ca-certificates libcap' returned a non-zero code: 4

[alexbers]

it is probably the network problems

please retry from the master branch, it is based on debian now instead of alpine

[enghamid]

it is probably the network problems

please retry from the master branch, it is based on debian now instead of alpine

[root@kai mtprotoproxy]# curl -v -s http://dl-cdn.alpinelinux.org/alpine/v3.10/community/x86_64/APKINDEX.tar.gz > /dev/null
*   Trying 151.101.12.249...
* TCP_NODELAY set
* Connected to dl-cdn.alpinelinux.org (151.101.12.249) port 80 (#0)
> GET /alpine/v3.10/community/x86_64/APKINDEX.tar.gz HTTP/1.1
> Host: dl-cdn.alpinelinux.org
> User-Agent: curl/7.61.1
> Accept: */*
> 
< HTTP/1.1 200 OK
< Server: nginx
< Content-Type: application/octet-stream
< Last-Modified: Mon, 02 Mar 2020 12:37:23 GMT
< ETag: "5e5cfe03-a24b5"
< Strict-Transport-Security: max-age=31536000
< X-Frame-Options: DENY
< X-Content-Type-Options: nosniff
< Via: 1.1 varnish
< Content-Length: 664757
< Accept-Ranges: bytes
< Date: Mon, 02 Mar 2020 14:49:22 GMT
< Via: 1.1 varnish
< Age: 5
< Connection: keep-alive
< X-Served-By: cache-jfk8120-JFK, cache-fra19143-FRA
< X-Cache: HIT, HIT
< X-Cache-Hits: 1, 1
< X-Timer: S1583160563.729824,VS0,VE84
< 
{ [2848 bytes data]
* Connection #0 to host dl-cdn.alpinelinux.org left intact

so, how can I use docker master branch? I am a beginner to Docker's use In the following I use centos8.

[alexbers]

git checkout master