Adding instructions to build telemetry server/go client inside docker (…

…sonic-net#68)

* add telemetry server build

* add empty dump and resolve comments

* add net host in docker run

* add comment to redis

doc/telemetry-dev-env/Dockerfile

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+FROM ubuntu:18.04
+
+# fundemantals
+RUN apt-get update
+RUN apt-get install -y wget
+RUN apt-get install -y ssh xinetd rsync patch
+RUN apt-get install -y iproute2
+RUN apt-get install -y gcc
+RUN apt-get install -y cmake
+RUN apt-get install -y make
+RUN apt-get install -y openssh-server
+RUN apt-get install -y python3 python3-pip
+RUN apt-get install -y tmux
+
+# install go and configure
+RUN wget https://golang.org/dl/go1.14.14.linux-amd64.tar.gz -O /tmp/go1.14.14.linux-amd64.tar.gz
+RUN tar -C /usr/local -xzf /tmp/go1.14.14.linux-amd64.tar.gz
+RUN mkdir /usr/gopath
+ENV GOPATH="/usr/gopath"
+ENV GOROOT="/usr/local/go"
+ENV PATH="${GOPATH}/bin:${GOROOT}/bin:${PATH}"
+
+# Dev libs required for libyang
+RUN apt-get install -y bison
+RUN apt-get install -y flex
+RUN apt-get install -y libpcre3 libpcre3-dev
+
+# Download libyang and install.
+RUN pip3 install pyang
+RUN wget https://github.com/CESNET/libyang/archive/v1.0.184.tar.gz -O /tmp/libyang-v1.0.184.tar.gz
+RUN tar -C /tmp -xzf /tmp/libyang-v1.0.184.tar.gz
+RUN mkdir /tmp/libyang-1.0.184/build && cd /tmp/libyang-1.0.184/build && cmake ..  && make && make install
+
+RUN apt-get install -y redis
+
+RUN sed -i "s/bind .*/bind 127.0.0.1/g" /etc/redis/redis.conf
+RUN echo "unixsocket /var/run/redis/redis.sock" >> /etc/redis/redis.conf
+COPY files/* /tmp
+
+# SSH settings
+EXPOSE 22/tcp
+# Following will expose 6379 port. Not needed except dugging.
+EXPOSE 6379/tcp
+
+ENTRYPOINT service ssh restart && bash

doc/telemetry-dev-env/Readme.md

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+Goto doc/telemetry-dev-env
+Build the image:
+```
+docker build -t telemetry-dev .
+```
+
+Remove container if it exist already:
+```
+docker rm telemetry-dev-env
+```
+Create personal fork repo from sonic-telemetry from git
+
+Create directory '~/src' and Clone git repos in it:
+```
+git clone https://<your_github_username>@github.com/<your_github_username>/sonic-telemetry.git 
+git clone https://<your_github_username>@github.com/<your_github_username>/sonic-mgmt-common.git
+```
+
+Create a new container using the image:
+```
+docker run -it -v ~/src:/src --net=host --name telemetry-dev-env telemetry-dev
+```
+
+Build and start service (Inside container):
+```bash
+
+# Build sources
+cd /src/sonic-mgmt-common && make
+cd /src/sonic-telemetry && make all
+
+# Bootstrap DB. dump.rdb provided under files/ is empty. Please replace empty rdb file and then restart redis.
+mkdir -p /var/run/redis/sonic-db && chown redis  /var/run/redis/sonic-db && install testdata/database_config.json -t /var/run/redis/sonic-db
+service redis-server stop && cp /files/dump.rdb /var/lib/redis/dump.rdb && service redis-server start
+
+# Start the service
+./build/bin/telemetry --port 8080 -insecure --allow_no_client_auth --logtostderr  -v 10
+```
+
+Make a client query (Inside container):
+```bash
+
+# Make another connection to container
+docker exec -it telemetry-dev-env bash
+
+# Make a query
+/src/sonic-telemetry/build/bin/gnmi_cli -client_types=gnmi -a 127.0.0.1:8080 -t OTHERS -logtostderr -insecure -qt p -pi 10s -q proc/loadavg
+```