Docker Error: container id followed by "command not found" - mysql

Question

I'm having difficulty with a script I'm writing. The script is largely incomplete, but so far I expect it to be able to run containers successfully. When I execute the script I'm given an error with a container ID and "command not found". For example: ./wordpress: line 73: 3c0fba4984f3b70f0eb3f1c15a7b157f4862b9b243657a3d2f7141029fb6641a: command not found
The script I'm using is as follows:
#!/bin/bash
echo "Setting Constants"
MYSQL_ROOT_PASSWORD='password'
MYSQL_DATABASE='wordpress'
WORDPRESS_DB_PASSWORD='password'
WP_PORT='80'
DB_PORT='3306'
EPOCH=$(date +%s) # append EPOCH to container names for uniqueness
#FILE='blogcontainers' # filename containing container IDs
DB_CONTAINER_NAME="myblogdb$EPOCH"
WP_CONTAINER_NAME="myblog$EPOCH"
DB_IMG_NAME='blogdb' # MySQL Docker image
WP_IMG_NAME='blog' # WordPress Docker image
cd ~/myblog
WP_CID_FILE="$PWD/blog.cid"
DB_CID_FILE="$PWD/blogdb.cid"
if [ -f $DB_CID_FILE ]; then
DB_IMG_ID=$(sed -n '1p' $DB_CID_FILE)
else
echo "dbcid not found"
# set to baseline image
DB_IMG_ID="f09a5b2903dc"
fi
if [ -f $WP_CID_FILE ]; then
WP_IMG_ID=$(sed -n '1p' $WP_CID_FILE)
else
echo "wpcid not found"
# set to baseline image
WP_IMG_ID="a8d48bc2313d"
fi
DB_PATH='/var/lib/mysql' # standard MySQL path
WP_PATH='/var/www/html' # standard WordPress path
LOCAL_DB_PATH="/$PWD$DB_PATH"
LOCAL_WP_PATH="/$PWD$WP_PATH"
echo "Starting MySQL Container"
#DB_ID=
$(docker run \
-e MYSQL_ROOT_PASSWORD=$MYSQL_ROOT_PASSWORD \
-e MYSQL_DATABASE=$MYSQL_DATABASE \
-v $LOCAL_WP_PATH:$DB_PATH \
-v /$PWD/.bash_history:$WP_PATH \
--name $DB_CONTAINER_NAME \
-p $DB_PORT:3306 \
--cidfile $DB_CID_FILE \
-d \
$DB_IMG_ID)
echo "Starting WordPress Container"
#WP_ID=
$(docker run \
-e WORDPRESS_DB_PASSWORD=$WORDPRESS_DB_PASSWORD \
--link $DB_CONTAINER_NAME:$DB_IMG_NAME \
-p $WP_PORT:80 \
-v $LOCAL_WP_PATH:$WP_PATH \
-v /$PWD/.bash_history:/root/.bash_history \
--name $WP_CONTAINER_NAME \
--cidfile $WP_CID_FILE \
-d \
$WP_IMG_ID)
echo $WP_CONTAINER_NAME
echo $WP_IMG_ID
echo "reached end"
#echo $WP_ID > $FILE # copy WordPress container ID to file
#echo $DB_ID >> $FILE # append MySQL container ID to file
After executing the code there usually is a MySQL container instance running. For example:
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4f2e9ab14c2e f09a5b2903dc "/entrypoint.sh mysql" 2 seconds ago Up 2 seconds 0.0.0.0:3306->3306/tcp myblogdb1449768739
Also, both blog.cid and blogdb.cid are created successfully containing container IDs.
$ cat blog.cid
e6005bcb4dba524b121d02b301fbe421d67d60986c55d554a0e20443df27ed18
$ cat blogdb.cid
4f2e9ab14c2ea5361557a3714477d7758c993af3b08bbc7db529282a41f90959
I've been troubleshooting and searching around for answers, but I think it's time to have another set of eyes take a look at it. As always, any input/criticism are welcome.

Answer 1

You are using $(docker run ...) instead of simply docker run .... The command substitution ($(...)) runs the command, captures the output, and expands to that output. As a result, you are trying to run the output of docker run as a command.