Unable to run docker build inside Jenkinsfile - docker

Question

On doing docker build inside Jenkinsfile,
i.e
docker build -f ./Dockerfile -t datastore:1.0.1 .
I am getting error like
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
This is my Jenkinsfile
#!/usr/bin/groovy
node {
checkout scm
// Here are the important data for this build
def DOCKER_REGISTRY = "XXX"
def DATASTORE = "datastore"
def DOCKER_TAG_DATASTORE = "${DOCKER_REGISTRY}/XXX"
def APP_VERSION = "1.0.1"
stage('Build') {
dockerInside('XXX/db-server:1.0.114', '') {
echo "Setting up artifactory location to push docker image ${DATASTORE}:${APP_VERSION}"
sh "docker build -f ./Dockerfile -t ${DATASTORE}:${APP_VERSION} ."
sh "docker tag ${DATASTORE}:${APP_VERSION} ${DOCKER_TAG_DATASTORE}:${APP_VERSION}"
withCredentials([
usernamePassword(
credentialsId: CORE_IZ_USER,
usernameVariable: 'LOG',
passwordVariable: 'PAS'
)]) {
// Doing some upload commands (see artifactory or docker upload commands from Jenkins)
sh "docker push ${DOCKER_TAG_DATASTORE}:${APP_VERSION}"
echo "Push to ${DOCKER_TAG_DATASTORE}:${APP_VERSION}"
}
}
}
stage('Docker image creation') {
echo "Docker image creation"
}
stage('Docker image upload') {
echo "Docker image upload"
}
}
This is my Dockerfile
FROM XXX/rhel:7.5
USER root
RUN yum -y install gcc && yum install -y git && yum install -y docker
# Install Go
RUN curl -O -s https://dl.google.com/go/go1.10.2.linux-amd64.tar.gz
RUN tar -xzf go1.10.2.linux-amd64.tar.gz -C /usr/local
ENV PATH /usr/local/go/bin:$PATH
ENV GOPATH /gopath
ENV GOBIN /usr/local/go/bin
WORKDIR /gopath/src/XXX
RUN mkdir -p /gopath/src/XXX
ADD . /gopath/src/XXX
RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=1 go build -tags netgo -installsuffix netgo -o ./db-server /gopath/src/XXX/datastore/main.go
ADD ./db-server /db-server
ENTRYPOINT ["/db-server"]