Docker FAQ

Problem

You tried to delete an image but received the following error message
[root@centos7 docker]# docker rmi d0b4a01f1562
Error response from daemon: conflict: unable to delete d0b4a01f1562 (must be forced) - image is being used by stopped container 98f6a5df3226

Solution

Run the following command to list container with exited state
[root@centos7 docker]# docker ps --filter "status=exited"
CONTAINER ID        IMAGE                                                          COMMAND                  CREATED             STATUS                      PORTS               NAMES
979e2873a16e        96f5373b33b7                                                   "/bin/sh -c '$JBOSS_H"   2 hours ago         Exited (127) 2 hours ago                        evil_fermi
e1c5ce9a8b9c        ef5a0201b5c2                                                   "/bin/sh -c 'yum -y u"   2 hours ago         Exited (126) 2 hours ago                        boring_swanson
98f6a5df3226        d0b4a01f1562                                                   "/bin/sh -c 'unzip /t"   2 hours ago         Exited (127) 2 hours ago                        desperate_knuth
62db7be0cc59        7a69c0ca54ef                                                   "/bin/sh -c 'subscrip"   2 hours ago         Exited (1) 2 hours ago                          naughty_carson
be10ff34189d        7a69c0ca54ef                                                   "/bin/sh -c 'subscrip"   2 hours ago         Exited (1) 2 hours ago                          cocky_pare
65fd609bd328        7a69c0ca54ef                                                   "/bin/sh -c 'subscrip"   3 hours ago         Exited (1) 3 hours ago                          suspicious_aryabhata
4793dd8fc355        e1e33a64e1f2                                                   "/bin/sh -c 'apt-get "   20 hours ago        Exited (127) 20 hours ago                       compassionate_hawking
4c810163a0eb        registry.access.redhat.com/rhel7.3                             "/bin/bash"              22 hours ago        Exited (1) 21 hours ago                         loving_mayer
cd6bf1b1b154        395d9b3d55fe                                                   "/bin/sh -c 'subscrip"   22 hours ago        Exited (1) 22 hours ago                         tender_gates
7badf972bc09        395d9b3d55fe                                                   "/bin/sh -c 'subscrip"   22 hours ago        Exited (1) 22 hours ago                         amazing_liskov
790495e566fb        395d9b3d55fe                                                   "/bin/sh -c 'subscrip"   22 hours ago        Exited (1) 22 hours ago                         furious_hopper
f7c1b9defc7c        registry.access.redhat.com/rhel7.3                             "/bin/bash"              
92de70df12f0        395d9b3d55fe                                                   "/bin/sh -c 'apt-get "   22 hours ago        Exited (127) 22 hours ago                       zen_jepsen
fe6e743a0ed0        395d9b3d55fe                                                   "/bin/sh -c 'yum upda"   23 hours ago        Exited (1) 23 hours ago                         gigantic_agnesi
c00625480570        98776dd34e6d                                                   "/bin/sh -c 'yum upda"   23 hours ago        Exited (1) 23 hours ago                         gloomy_shannon
02f74106ed39        registry.access.redhat.com/rhel7.3                             "/bin/bash"              23 hours ago        Exited (127) 23 hours ago                       stupefied_gates
d658f7182fcc        e8e3aaf82af5                                                   "/bin/bash"              23 hours ago        Exited (0) 23 hours ago                         adoring_feynman

You can delete list of exited container with following commands
docker ps --filter "status=exited" | grep '2 hours ago' | awk '{print $1}' | xargs --no-run-if-empty docker rm
Take note take that condition will also delete container with x2hours ago status.

iPhone - How To Enable/Disable SIM PIN

1. From Home screen, navigate to Setting -> Phone and SIM PIN.

2. Tap on the SIM PIN switch to turn on(in green) or turn off(dimmed)


3. Enter SIM PIN for verification. Most of the time, default password would be 0123 or 1234. I do suggest you to get in touch with your telco should you need confirmation else SIM card will be locked after 5 password failure attempts.

Install Apache HTTPD 2.4 on centOS 6

Follow steps below:-

# 1. Install a package with repository for your system:
# On CentOS, install package centos-release-scl available in CentOS repository:
$ sudo yum install centos-release-scl

# On RHEL, enable RHSCL repository for you system:
$ sudo yum-config-manager --enable rhel-server-rhscl-7-rpms


[root@ip-10-129-10-192 yum.repos.d]# sudo yum install centos-release-scl

Loaded plugins: fastestmirror, presto

Setting up Install Process

Loading mirror speeds from cached hostfile

 * base: download.nus.edu.sg

 * epel: mirror.wanxp.id

 * extras: download.nus.edu.sg

 * remi: mirrors.thzhost.com

 * remi-safe: mirrors.thzhost.com

 * updates: download.nus.edu.sg

Resolving Dependencies

--> Running transaction check

---> Package centos-release-scl.noarch 10:6-6.el6.centos will be installed

--> Processing Dependency: centos-release-scl-rh for package: 10:centos-release-scl-6-6.el6.centos.noarch

--> Running transaction check

---> Package centos-release-scl-rh.noarch 0:2-1.el6.centos will be installed

--> Finished Dependency Resolution

# 2. Install the collection:
$ sudo yum install httpd24












[root@ip-10-129-10-192 yum.repos.d]# sudo yum install httpd24

Loaded plugins: fastestmirror, presto

Setting up Install Process

Loading mirror speeds from cached hostfile

 * base: download.nus.edu.sg

 * epel: mirror.smartmedia.net.id

 * extras: download.nus.edu.sg

 * remi: mirrors.thzhost.com

 * remi-safe: mirrors.thzhost.com

 * updates: download.nus.edu.sg

centos-sclo-rh                                                                                         | 2.9 kB     00:00     

centos-sclo-rh/primary_db                                                                              | 1.2 MB     00:03     

centos-sclo-sclo                                                                                       | 2.9 kB     00:00     

centos-sclo-sclo/primary_db                                                                            |  59 kB     00:00     

Resolving Dependencies

--> Running transaction check

---> Package httpd24.x86_64 0:1.1-5.el6 will be installed

# 3. Start using the software collection:
$ scl enable httpd24 bash

Conf file path - /opt/rh/httpd24/root/etc/conf
Web Code path - /opt/rh/httpd24/root/var/www/html