Running Fuse and Mysql in PACC/Docker container

                                Running Fuse and Mysql in PACC/Docker container 


Recently I worked on an interesting issue where the requirement was to start 2 services in a container at the same time, A container’s main running process is the ENTRYPOINT and/or CMD at the end of the Dockerfile. It is generally recommended to have one service per container and then connect multiple containers using user-defined networks and shared volumes etc but this was against our requirement where i wanted to mount Fuse and then start mysql to write data to remote MapR cluster via Fuse.

Ideal way to achieve this would be using supervisord to manage the start and sequence of services to be started as suggested by docker below.

https://docs.docker.com/engine/admin/multi-service_container/

But this would require sometime to stitch things together we had another idea to use system bashrc to achieve this and as second workaround use CMD in docker file.  This blog will describe two ways we worked around docker limitation to have only one entry point and were able to start fuse and Mysql in PACC container.

Work Around 1 :

1) Below is docker file we wrote and it has comments to make things clear

[root@noderhel73 PACC_MYSQL]# cat Dockerfile 

#use PACC image to start from

FROM maprtech/pacc:5.2.2_3.0.1_centos7 

# add our user and group first to make sure their IDs get assigned consistently, regardless of\ whatever dependencies get added

RUN groupadd -r mysql && useradd -r -g mysql mysql

# Install Percona Mysql

RUN rpm --import https://www.percona.com/downloads/RPM-GPG-KEY-percona

RUN yum install -y http://www.percona.com/downloads/percona-release/redhat/0.1-4/percona-release-0.1-4.noarch.rpm https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm\

&& yum -y update && yum install -y which nc sysbench perl-Digest-MD5 percona-xtrabackup-24 Percona-Server-{client,server,shared,test}-57 \

# Clean up YUM when done.

&& yum clean all && rm -rf /var/lib/mysql && mkdir -p /var/lib/mysql /var/log/mysql \

&& chown -R mysql:mysql /var/lib/mysql /var/log/mysql && chmod -R 755 /var/lib/mysql /var/log/mysql

ADD my.cnf /etc/my.cnf

VOLUME ["/var/lib/mysql","/var/lib/mysqld/", "/var/log/mysql"]

# Install server

COPY ps-entry.sh /entrypoint.sh

RUN chmod 755 /entrypoint.sh

# start Mysql once login shell is avail only once.

COPY bashrc /root/.bashrc

#Copy master_nc file and give it executable permission into docker

COPY master_nc /usr/bin/master_nc

RUN chmod 755 /usr/bin/master_nc

EXPOSE 3306

CMD ["mysqld","-umysql"]

[root@noderhel73 PACC_MYSQL]# 

2) Now there are few files which are in play and i would like to point out . Here master_nc,my.cnf and ps-entry.sh are Mysql start up scripts and configs while rest i will talk about in next steps.

[root@noderhel73 PACC_MYSQL_clean]# ls

bashrc  Dockerfile  mapr-docker-client.sh master_nc  my.cnf  ps-entry.sh

3) Looking at below step in Docker file I wanted to explain why i am copying customer bashrc file , This file has logic which will trigger start of Mysql once the container shell comes up.

# start Mysql once login shell is avail only once.

COPY bashrc /root/.bashrc

Also as seen below I have added extra logic to start Mysql only once to take care of case when folks login into bash shell of container multiple times Mysql shouldn't be attempted to be started.

[root@noderhel73 PACC_MYSQL]# cat bashrc 

# .bashrc

# User specific aliases and functions

alias rm='rm -i'

alias cp='cp -i'

alias mv='mv -i'

# Source global definitions

if [ -f /etc/bashrc ]; then

. /etc/bashrc

fi

if [ -f /root/entry.pid ]; then

   echo "Mysql started"

else 

# If file don't exist run mysql startup and create a pid file   

   /entrypoint.sh

pidof mysqld > /root/entry.pid

fi

[root@noderhel73 PACC_MYSQL]#

4)  Now I will go ahead and build my Image successfully.

[root@noderhel73 PACC_MYSQL]# docker build -t my_mapr_pacc_mysql_slim .

Sending build context to Docker daemon  123.4kB

Step 1/13 : FROM maprtech/pacc:5.2.2_3.0.1_centos7

 ---> 4c0ff48eae3d

Step 2/13 : RUN groupadd -r mysql && useradd -r -g mysql mysql

 ---> Using cache

 ---> 7cf3fc7871dc

Step 3/13 : RUN rpm --import https://www.percona.com/downloads/RPM-GPG-KEY-percona

 ---> Using cache

 ---> 50437632122f

Step 4/13 : RUN yum install -y http://www.percona.com/downloads/percona-release/redhat/0.1-4/percona-release-0.1-4.noarch.rpm https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm&& yum -y update && yum install -y which nc sysbench perl-Digest-MD5 percona-xtrabackup-24 Percona-Server-{client,server,shared,test}-57 && yum clean all && rm -rf /var/lib/mysql && mkdir -p /var/lib/mysql /var/log/mysql && chown -R mysql:mysql /var/lib/mysql /var/log/mysql && chmod -R 755 /var/lib/mysql /var/log/mysql

 ---> Using cache

 ---> 352ddd303fd2

Step 5/13 : ADD my.cnf /etc/my.cnf

 ---> Using cache

 ---> bfda5e73eb5a

Step 6/13 : VOLUME /var/lib/mysql /var/lib/mysqld/ /var/log/mysql

 ---> Using cache

 ---> d75a54f5f1d2

Step 7/13 : COPY ps-entry.sh /entrypoint.sh

 ---> Using cache

 ---> aa501ee7b56b

Step 8/13 : RUN chmod 755 /entrypoint.sh

 ---> Using cache

 ---> 2af88e821949

Step 9/13 : COPY bashrc /root/.bashrc

 ---> 7ffd9722beab

Removing intermediate container 84444f107c82

Step 10/13 : COPY master_nc /usr/bin/master_nc

 ---> 9710594e7d49

Removing intermediate container 5f98352760af

Step 11/13 : RUN chmod 755 /usr/bin/master_nc

 ---> Running in 6601f0a0339e

 ---> cb0b2ef92b2d

Removing intermediate container 6601f0a0339e

Step 12/13 : EXPOSE 3306

 ---> Running in 2e5f63c80695

 ---> ab77631bfbb9

Removing intermediate container 2e5f63c80695

Step 13/13 : CMD mysqld -umysql

 ---> Running in 0ea3d8d3dd87

 ---> b0a7dc6f38dc

Removing intermediate container 0ea3d8d3dd87

Successfully built b0a7dc6f38dc

[root@noderhel73 PACC_MYSQL_clean]#

5) Docker image is built and ready to be deployed .

[root@noderhel73 PACC_MYSQL]# docker images | grep slim

my_mapr_pacc_mysql_slim    latest                b0a7dc6f38dc        53 seconds ago      1.34GB

6)  Below script is nothing but gathers all the arguments and runs docker start with required options.

[root@noderhel73 PACC_MYSQL]# cat mapr-docker-client.sh 

#!/bin/sh

# The environment variables in this file are for example only. These variables

# must be altered to match your docker container deployment needs

MAPR_CLUSTER=dsemapr

MAPR_CLDB_HOSTS=10.10.70.117

# MapR POSIX client mount path to enable direct MapR-FS access

MAPR_MOUNT_PATH=/mapr

# MapR secure cluster ticket file path

MAPR_TICKETFILE_LOCATION=

# MapR client user / group

MAPR_CONTAINER_USER=$(id -u -n)

MAPR_CONTAINER_UID=$(id -u)

MAPR_CONTAINER_GROUP=$(id -g -n)

MAPR_CONTAINER_GID=$(id -g)

MAPR_CONTAINER_PASSWORD=

# Container memory: specify host XX[kmg] or 0 for no limit. Ex: 8192m, 12g

MAPR_MEMORY=0

# Container timezone: filename from /usr/share/zoneinfo

MAPR_TZ=${TZ:-"America/New_York"}

# Container network mode: "host" causes the container's sshd service to conflict

# with the host's sshd port (22) and so it will not be enabled in that case

MAPR_DOCKER_NETWORK=bridge

# Container security: --privileged or --cap-add SYS_ADMIN /dev/<device>

MAPR_DOCKER_SECURITY="$([ -n $"MAPR_MOUNT_PATH" ] && echo "--cap-add SYS_ADMIN --cap-add SYS_RESOURCE --device /dev/fuse")"

# Other Docker run args:

MAPR_DOCKER_ARGS="-e MYSQL_ROOT_PASSWORD=<MySQL passwd>"

### do not edit below this line ###

grep -q -s DISTRIB_ID=Ubuntu /etc/lsb-release && \

  MAPR_DOCKER_SECURITY="$MAPR_DOCKER_SECURITY --security-opt apparmor:unconfined"

MAPR_DOCKER_ARGS="$MAPR_DOCKER_SECURITY \

  --memory $MAPR_MEMORY \

  --network=$MAPR_DOCKER_NETWORK \

  -e MAPR_DISKS=$MAPR_DISKS \

  -e MAPR_CLUSTER=$MAPR_CLUSTER \

  -e MAPR_LICENSE_MODULES=$MAPR_LICENSE_MODULES \

  -e MAPR_MEMORY=$MAPR_MEMORY \

  -e MAPR_MOUNT_PATH=$MAPR_MOUNT_PATH \

  -e MAPR_SECURITY=$MAPR_SECURITY \

  -e MAPR_TZ=$MAPR_TZ \

  -e MAPR_USER=$MAPR_USER \

  -e MAPR_CONTAINER_USER=$MAPR_CONTAINER_USER \

  -e MAPR_CONTAINER_UID=$MAPR_CONTAINER_UID \

  -e MAPR_CONTAINER_GROUP=$MAPR_CONTAINER_GROUP \

  -e MAPR_CONTAINER_GID=$MAPR_CONTAINER_GID \

  -e MAPR_CONTAINER_PASSWORD=$MAPR_CONTAINER_PASSWORD \

  -e MAPR_CLDB_HOSTS=$MAPR_CLDB_HOSTS \

  -e MAPR_HS_HOST=$MAPR_HS_HOST \

  -e MAPR_OT_HOSTS=$MAPR_OT_HOSTS \

  -e MAPR_ZK_HOSTS=$MAPR_ZK_HOSTS \

  $MAPR_DOCKER_ARGS"

[ -f "$MAPR_TICKETFILE_LOCATION" ] && MAPR_DOCKER_ARGS="$MAPR_DOCKER_ARGS \

  -e MAPR_TICKETFILE_LOCATION=/tmp/mapr_ticket \

  -v $MAPR_TICKETFILE_LOCATION:/tmp/mapr_ticket:ro"

[ -d /sys/fs/cgroup ] && MAPR_DOCKER_ARGS="$MAPR_DOCKER_ARGS -v /sys/fs/cgroup:/sys/fs/cgroup:ro"

echo $MAPR_DOCKER_ARGS

docker run -it $MAPR_DOCKER_ARGS my_mapr_pacc_mysql_slim:latest "$@"

[root@noderhel73 PACC_MYSQL]#

7) You should see below log messages on the screen where Fuse will start first and then mysql will startup .

[root@noderhel73 PACC_MYSQL_clean]# sh mapr-docker-client.sh 

--cap-add SYS_ADMIN --cap-add SYS_RESOURCE --device /dev/fuse --memory 0 --network=bridge -e MAPR_DISKS= -e MAPR_CLUSTER=dsemapr -e MAPR_LICENSE_MODULES= -e MAPR_MEMORY=0 -e MAPR_MOUNT_PATH=/mapr -e MAPR_SECURITY= -e MAPR_TZ=America/New_York -e MAPR_USER= -e MAPR_CONTAINER_USER=root -e MAPR_CONTAINER_UID=0 -e MAPR_CONTAINER_GROUP=root -e MAPR_CONTAINER_GID=0 -e MAPR_CONTAINER_PASSWORD= -e MAPR_CLDB_HOSTS=10.10.70.117 -e MAPR_HS_HOST= -e MAPR_OT_HOSTS= -e MAPR_ZK_HOSTS= -e MYSQL_ROOT_PASSWORD=<MySQL passwd> -v /sys/fs/cgroup:/sys/fs/cgroup:ro

Testing for cluster user account... 

Enter MapR cluster user name: root

 ...Success 

/opt/mapr/installer/docker/mapr-setup.sh: line 1815: /home/root/.bashrc: No such file or directory

Configuring MapR client ( -c -C 10.10.70.117 -N dsemapr)... 

create /opt/mapr/conf/conf.old

CLDB node list: 10.10.70.117:7222

Zookeeper node list: 

Cluster conf:  /opt/mapr/conf/mapr-clusters.conf

Log can be found at:  /opt/mapr/logs/configure.log

Note: No Hadoop configuration with this configure script.

...Success 

Starting services (mapr-posix-client-container)... 

Started service mapr-posix-client-container 

...Success 

Running --initialize-insecure

2017-09-01T04:32:26.710049Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).

2017-09-01T04:32:35.632814Z 0 [Warning] InnoDB: New log files created, LSN=45790

2017-09-01T04:32:36.829590Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.

2017-09-01T04:32:37.200327Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: 94fb705c-8ece-11e7-acc7-0242ac110002.

2017-09-01T04:32:37.216356Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.

2017-09-01T04:32:37.744596Z 0 [Warning] CA certificate ca.pem is self signed.

2017-09-01T04:32:37.953911Z 1 [Warning] root@localhost is created with an empty password ! Please consider switching off the --initialize-insecure option.

Finished --initialize-insecure

MySQL init process in progress...

--------

--------

--------

MySQL init process done. Ready for start up.

Starting listener for slave requests

9)  Docker container has started wait for couple of minutes for Mysql to come up completely and be available to serve requests.

[root@noderhel73 ~]# docker ps

CONTAINER ID        IMAGE                            COMMAND                  CREATED             STATUS              PORTS               NAMES

cdb89498ef2f        my_mapr_pacc_mysql_slim:latest   "/opt/mapr/install..."   8 minutes ago       Up 8 minutes        3306/tcp            nostalgic_thompson

[root@noderhel73 ~]#

10 )  After you have waited a few mins you can login into Mysql inside the container as below and validate . 

[root@noderhel73 ~]# docker exec -it nostalgic_thompson mysql -u root -p<MySQL passwd>

mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 3

Server version: 5.7.19-17-log Percona Server (GPL), Release 17, Revision e19a6b7b73f

Copyright (c) 2009-2017 Percona LLC and/or its affiliates

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;

+--------------------+

| Database           |

+--------------------+

| information_schema |

| mysql              |

| performance_schema |

| sys                |

+--------------------+

4 rows in set (0.00 sec)

mysql> 

11)   Once you login into bash shell you should see message as below and get dropped into container shell, validate Fuse is mounted .

[root@noderhel73 ~]# docker exec -it nostalgic_thompson bash

Mysql started

[root@cdb89498ef2f /]# df -hP /mapr

Filesystem              Size  Used Avail Use% Mounted on

posix-client-container  119G  497M  118G   1% /mapr

[root@cdb89498ef2f /]# 

We can validate the lock file for pid is created .

[root@cdb89498ef2f /]# ps -ef| grep 533 | grep -v grep

mysql      533     1  0 00:32 ?        00:00:01 mysqld --user=mysql --server-id=2886795266 --log-error=/var/lib/mysql/error.log

[root@cdb89498ef2f /]# cat /root/entry.pid 

533

[root@cdb89498ef2f /]# ps -ef| grep 533 | grep -v grep

mysql      533     1  0 00:32 ?        00:00:01 mysqld --user=mysql --server-id=2886795266 --log-error=/var/lib/mysql/error.log

[root@cdb89498ef2f /]# 

Now even if multiple folks execute exec command , mysql will not be attempted to be started.

[root@cdb89498ef2f /]# exit

exit

[root@noderhel73 ~]# docker exec -it nostalgic_thompson bash

Mysql started

[root@cdb89498ef2f /]# exit

exit

[root@noderhel73 ~]# docker exec -it nostalgic_thompson bash

Mysql started

[root@cdb89498ef2f /]# exit

exit

[root@noderhel73 ~]# docker exec -it nostalgic_thompson bash

Mysql started

[root@cdb89498ef2f /]#

Work Around 2 :



An easier way to achieve the same objective using modified docker file.

1) Below is docker file we modified and it has comments to make things clear

FROM maprtech/pacc:5.2.2_3.0.1_centos7 

# add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added

RUN groupadd -r mysql && useradd -r -g mysql mysql

# Install Percona Mysql

RUN rpm --import https://www.percona.com/downloads/RPM-GPG-KEY-percona

RUN yum install -y http://www.percona.com/downloads/percona-release/redhat/0.1-4/percona-release-0.1-4.noarch.rpm https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm\

&& yum -y update && yum install -y which nc sysbench perl-Digest-MD5 percona-xtrabackup-24 Percona-Server-{client,server,shared,test}-57 \

# Clean up YUM when done.

&& yum clean all && rm -rf /var/lib/mysql && mkdir -p /var/lib/mysql /var/log/mysql \

&& chown -R mysql:mysql /var/lib/mysql /var/log/mysql && chmod -R 755 /var/lib/mysql /var/log/mysql

ADD my.cnf /etc/my.cnf

VOLUME ["/var/lib/mysql","/var/lib/mysqld/", "/var/log/mysql"]

# Install server

COPY ps-entry.sh /entrypoint.sh

RUN chmod 755 /entrypoint.sh

#Copy master_nc file and give it executable permission into docker

COPY master_nc /usr/bin/master_nc

RUN chmod 755 /usr/bin/master_nc

EXPOSE 3306

# start Mysql

CMD ["/entrypoint.sh"]

2) Now build the image .

[root@noderhel73 PACC_MYSQL]# docker build -t my_mapr_pacc_mysql_final .

Sending build context to Docker daemon  15.36kB

Step 1/12 : FROM maprtech/pacc:5.2.2_3.0.1_centos7

 ---> 4c0ff48eae3d

Step 2/12 : RUN groupadd -r mysql && useradd -r -g mysql mysql

 ---> Using cache

 ---> 7cf3fc7871dc

Step 3/12 : RUN rpm --import https://www.percona.com/downloads/RPM-GPG-KEY-percona

 ---> Using cache

 ---> 50437632122f

Step 4/12 : RUN yum install -y http://www.percona.com/downloads/percona-release/redhat/0.1-4/percona-release-0.1-4.noarch.rpm https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm&& yum -y update && yum install -y which nc sysbench perl-Digest-MD5 percona-xtrabackup-24 Percona-Server-{client,server,shared,test}-57 && yum clean all && rm -rf /var/lib/mysql && mkdir -p /var/lib/mysql /var/log/mysql && chown -R mysql:mysql /var/lib/mysql /var/log/mysql && chmod -R 755 /var/lib/mysql /var/log/mysql

 ---> Using cache

 ---> 352ddd303fd2

Step 5/12 : ADD my.cnf /etc/my.cnf

 ---> Using cache

 ---> bfda5e73eb5a

Step 6/12 : VOLUME /var/lib/mysql /var/lib/mysqld/ /var/log/mysql

 ---> Using cache

 ---> d75a54f5f1d2

Step 7/12 : COPY ps-entry.sh /entrypoint.sh

 ---> Using cache

 ---> f762ec517e41

Step 8/12 : RUN chmod 755 /entrypoint.sh

 ---> Using cache

 ---> 73e6491b44aa

Step 9/12 : COPY master_nc /usr/bin/master_nc

 ---> Using cache

 ---> 09f5857690f9

Step 10/12 : RUN chmod 755 /usr/bin/master_nc

 ---> Using cache

 ---> 704149f5de7b

Step 11/12 : EXPOSE 3306

 ---> Using cache

 ---> 27ff296a096e

Step 12/12 : CMD sudo -E /entrypoint.sh

 ---> Running in 74ac2c167b50

 ---> 7d171e429741

Removing intermediate container 74ac2c167b50

Successfully built 7d171e429741

[root@noderhel73 PACC_MYSQL]# 

3) Below script is nothing but gathers all the arguments and runs docker start with required options.

[root@noderhel73 PACC_MYSQL_APP]# cat mapr-docker-client.sh 

#!/bin/sh

# The environment variables in this file are for example only. These variables

# must be altered to match your docker container deployment needs

MAPR_CLUSTER=dsemapr

MAPR_CLDB_HOSTS=10.10.70.117

# MapR POSIX client mount path to enable direct MapR-FS access

MAPR_MOUNT_PATH=/mapr

# MapR secure cluster ticket file path

MAPR_TICKETFILE_LOCATION=

# MapR client user / group

MAPR_CONTAINER_USER=$(id -u -n)

MAPR_CONTAINER_UID=$(id -u)

MAPR_CONTAINER_GROUP=$(id -g -n)

MAPR_CONTAINER_GID=$(id -g)

MAPR_CONTAINER_PASSWORD=

# Container memory: specify host XX[kmg] or 0 for no limit. Ex: 8192m, 12g

MAPR_MEMORY=0

# Container timezone: filename from /usr/share/zoneinfo

MAPR_TZ=${TZ:-"America/New_York"}

# Container network mode: "host" causes the container's sshd service to conflict

# with the host's sshd port (22) and so it will not be enabled in that case

MAPR_DOCKER_NETWORK=bridge

# Container security: --privileged or --cap-add SYS_ADMIN /dev/<device>

MAPR_DOCKER_SECURITY="$([ -n $"MAPR_MOUNT_PATH" ] && echo "--cap-add SYS_ADMIN --cap-add SYS_RESOURCE --device /dev/fuse")"

# Other Docker run args:

MAPR_DOCKER_ARGS="-e MYSQL_ROOT_PASSWORD=<MySQL passwd>"

### do not edit below this line ###

grep -q -s DISTRIB_ID=Ubuntu /etc/lsb-release && \

  MAPR_DOCKER_SECURITY="$MAPR_DOCKER_SECURITY --security-opt apparmor:unconfined"

MAPR_DOCKER_ARGS="$MAPR_DOCKER_SECURITY \

  --memory $MAPR_MEMORY \

  --network=$MAPR_DOCKER_NETWORK \

  -e MAPR_DISKS=$MAPR_DISKS \

  -e MAPR_CLUSTER=$MAPR_CLUSTER \

  -e MAPR_LICENSE_MODULES=$MAPR_LICENSE_MODULES \

  -e MAPR_MEMORY=$MAPR_MEMORY \

  -e MAPR_MOUNT_PATH=$MAPR_MOUNT_PATH \

  -e MAPR_SECURITY=$MAPR_SECURITY \

  -e MAPR_TZ=$MAPR_TZ \

  -e MAPR_USER=$MAPR_USER \

  -e MAPR_CONTAINER_USER=$MAPR_CONTAINER_USER \

  -e MAPR_CONTAINER_UID=$MAPR_CONTAINER_UID \

  -e MAPR_CONTAINER_GROUP=$MAPR_CONTAINER_GROUP \

  -e MAPR_CONTAINER_GID=$MAPR_CONTAINER_GID \

  -e MAPR_CONTAINER_PASSWORD=$MAPR_CONTAINER_PASSWORD \

  -e MAPR_CLDB_HOSTS=$MAPR_CLDB_HOSTS \

  -e MAPR_HS_HOST=$MAPR_HS_HOST \

  -e MAPR_OT_HOSTS=$MAPR_OT_HOSTS \

  -e MAPR_ZK_HOSTS=$MAPR_ZK_HOSTS \

  $MAPR_DOCKER_ARGS"

[ -f "$MAPR_TICKETFILE_LOCATION" ] && MAPR_DOCKER_ARGS="$MAPR_DOCKER_ARGS \

  -e MAPR_TICKETFILE_LOCATION=/tmp/mapr_ticket \

  -v $MAPR_TICKETFILE_LOCATION:/tmp/mapr_ticket:ro"

[ -d /sys/fs/cgroup ] && MAPR_DOCKER_ARGS="$MAPR_DOCKER_ARGS -v /sys/fs/cgroup:/sys/fs/cgroup:ro"

echo $MAPR_DOCKER_ARGS

docker run -it $MAPR_DOCKER_ARGS my_mapr_pacc_mysql_final:latest "$@"

[root@noderhel73 PACC_MYSQL_APP]# 

4) Executing mapr-docker-client.sh script as ROOT starts the container and services we need.

[root@noderhel73 ~]# docker ps

CONTAINER ID        IMAGE                             COMMAND                  CREATED             STATUS              PORTS               NAMES

1145ee401a57        my_mapr_pacc_mysql_final:latest   "/opt/mapr/install..."   52 seconds ago      Up 51 seconds       3306/tcp            elated_neumann

cdb89498ef2f        my_mapr_pacc_mysql_slim:latest    "/opt/mapr/install..."   11 hours ago        Up 11 hours         3306/tcp            nostalgic_thompson

Validation :

[root@noderhel73 ~]# docker exec -it elated_neumann bash

[root@1145ee401a57 /]# df -hP

Filesystem              Size  Used Avail Use% Mounted on

overlay                  50G   30G   21G  60% /

tmpfs                   7.8G     0  7.8G   0% /dev

/dev/mapper/rhel-root    50G   30G   21G  60% /etc/hosts

shm                      64M     0   64M   0% /dev/shm

tmpfs                   7.8G     0  7.8G   0% /sys/fs/cgroup

tmpfs                   7.8G     0  7.8G   0% /sys/firmware

posix-client-container  119G  497M  118G   1% /mapr

[root@1145ee401a57 /]# exit

exit

[root@noderhel73 ~]# docker exec -it elated_neumann mysql -u root -p<MySQL passwd>

mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 3

Server version: 5.7.19-17-log Percona Server (GPL), Release 17, Revision e19a6b7b73f

Copyright (c) 2009-2017 Percona LLC and/or its affiliates

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;

+--------------------+

| Database           |

+--------------------+

| information_schema |

| mysql              |

| performance_schema |

| sys                |

+--------------------+

4 rows in set (0.00 sec)

mysql> 

Bingo ! we achieved our objective in 2 different ways.