volumes.txt

Volumes:
1. backup  -- unnamed volumes
    1.1 docker container run -d -v /var/log/apache2 app
    1.2 in the Dockerfile VOLUME /var/lib/mysql
    
2. reuse and backup - named volume
    2.1 $ docker container run -d -v proj-data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=welcome mysql:5.7

bind mounts:    
3. choose the dir where the data gets saved, reuse and backup    
    docker container run -d -v /tmp/logdata:/var/log/apache2 app
    
    
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Mounting a dir into container 
=====/home/docker
$ pwd
/home/docker

=====/home/docker
$ git clone https://github.com/AdityaSP/htmlonly
Cloning into 'htmlonly'...
remote: Enumerating objects: 63, done.
remote: Counting objects: 100% (63/63), done.
remote: Compressing objects: 100% (52/52), done.
remote: Total 63 (delta 9), reused 20 (delta 0), pack-reused 0
Unpacking objects: 100% (63/63), done.

=====/home/docker
$ ls
htmlonly

=====/home/docker
$ cd htmlonly/

=====/home/docker/htmlonly
$ ls
mypage.html  readme.txt

=====/home/docker/htmlonly
$ docker container run -d -p 9595:80 -v $PWD:/var/www/localhost/htdocs app
b07ec8e866ea3082929a5f33eea776501b21a9dbcdb1c8fbd5783431c5daa7ab

=====/home/docker/htmlonly
$ git pull
remote: Enumerating objects: 5, done.
remote: Counting objects: 100% (5/5), done.
remote: Compressing objects: 100% (3/3), done.
remote: Total 3 (delta 0), reused 0 (delta 0), pack-reused 0
Unpacking objects: 100% (3/3), done.
From https://github.com/AdityaSP/htmlonly
   f7e121c..e6f762f  master     -> origin/master
Updating f7e121c..e6f762f
Fast-forward
 mypage.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

=====/home/docker/htmlonly
$