Docker exec and docker run giving me different resolv.conf hosts
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I using docker compose to fire up two containers 1. flask webapp 2. mysql database. I have all my scripts written up and Dockerfile all ready to go and working. My app does a ping to other machines by hostnames and requires the resolv.conf to be the same as the host computer. After I fire up my docker-compose I can see both my containers running like this :
#:~/home/user # docker-compose images
/bin/sh: /tmp/_MEIXmPrg9/libreadline.so.7: no version information available (required by /bin/sh)
/bin/sh: /tmp/_MEIXmPrg9/libreadline.so.7: no version information available (required by /bin/sh)
Container Repository Tag Image Id Size
---------------------------------------------------------------------------
webapp-gui_app_1_1b87619cd08b webapp-gui_app latest f0982b82c556 467 MB
webapp-gui_db_1_bd74de835067 mysql 5.7 702fb0b7837f 355 MB
On my webapp, the ping command is not allowing me to ping by hostname, so when I try to run interactive mode to troubleshoot I noticed that when running with:
docker run -it webapp-gui_app_1_1b87619cd08b /bin/sh
This gives the correct resolv.conf and I am able to successfully ping the hostnames, however, when I run it like this
docker exec -u 0 -it webapp-gui_app_1_1b87619cd08b sh
My resolv.conf file changes to the following (incorrect resolv.conf), and I am not able to ping other local machines by hostname anymore. Does anyone know why?
/etc # cat resolv.conf
search mydomain.com
nameserver 127.0.0.11
options ndots:0
docker docker-compose hostname
asked Nov 21 at 0:04
user10067412
988
add a comment |
up vote
1
down vote
favorite
I using docker compose to fire up two containers 1. flask webapp 2. mysql database. I have all my scripts written up and Dockerfile all ready to go and working. My app does a ping to other machines by hostnames and requires the resolv.conf to be the same as the host computer. After I fire up my docker-compose I can see both my containers running like this :
#:~/home/user # docker-compose images
/bin/sh: /tmp/_MEIXmPrg9/libreadline.so.7: no version information available (required by /bin/sh)
/bin/sh: /tmp/_MEIXmPrg9/libreadline.so.7: no version information available (required by /bin/sh)
Container Repository Tag Image Id Size
---------------------------------------------------------------------------
webapp-gui_app_1_1b87619cd08b webapp-gui_app latest f0982b82c556 467 MB
webapp-gui_db_1_bd74de835067 mysql 5.7 702fb0b7837f 355 MB
On my webapp, the ping command is not allowing me to ping by hostname, so when I try to run interactive mode to troubleshoot I noticed that when running with:
docker run -it webapp-gui_app_1_1b87619cd08b /bin/sh
This gives the correct resolv.conf and I am able to successfully ping the hostnames, however, when I run it like this
docker exec -u 0 -it webapp-gui_app_1_1b87619cd08b sh
My resolv.conf file changes to the following (incorrect resolv.conf), and I am not able to ping other local machines by hostname anymore. Does anyone know why?
/etc # cat resolv.conf
search mydomain.com
nameserver 127.0.0.11
options ndots:0
docker docker-compose hostname
asked Nov 21 at 0:04
user10067412
988
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
I using docker compose to fire up two containers 1. flask webapp 2. mysql database. I have all my scripts written up and Dockerfile all ready to go and working. My app does a ping to other machines by hostnames and requires the resolv.conf to be the same as the host computer. After I fire up my docker-compose I can see both my containers running like this :
#:~/home/user # docker-compose images
/bin/sh: /tmp/_MEIXmPrg9/libreadline.so.7: no version information available (required by /bin/sh)
/bin/sh: /tmp/_MEIXmPrg9/libreadline.so.7: no version information available (required by /bin/sh)
Container Repository Tag Image Id Size
---------------------------------------------------------------------------
webapp-gui_app_1_1b87619cd08b webapp-gui_app latest f0982b82c556 467 MB
webapp-gui_db_1_bd74de835067 mysql 5.7 702fb0b7837f 355 MB
On my webapp, the ping command is not allowing me to ping by hostname, so when I try to run interactive mode to troubleshoot I noticed that when running with:
docker run -it webapp-gui_app_1_1b87619cd08b /bin/sh
This gives the correct resolv.conf and I am able to successfully ping the hostnames, however, when I run it like this
docker exec -u 0 -it webapp-gui_app_1_1b87619cd08b sh
My resolv.conf file changes to the following (incorrect resolv.conf), and I am not able to ping other local machines by hostname anymore. Does anyone know why?
/etc # cat resolv.conf
search mydomain.com
nameserver 127.0.0.11
options ndots:0
docker docker-compose hostname
asked Nov 21 at 0:04
user10067412
988
I using docker compose to fire up two containers 1. flask webapp 2. mysql database. I have all my scripts written up and Dockerfile all ready to go and working. My app does a ping to other machines by hostnames and requires the resolv.conf to be the same as the host computer. After I fire up my docker-compose I can see both my containers running like this :
#:~/home/user # docker-compose images
/bin/sh: /tmp/_MEIXmPrg9/libreadline.so.7: no version information available (required by /bin/sh)
/bin/sh: /tmp/_MEIXmPrg9/libreadline.so.7: no version information available (required by /bin/sh)
Container Repository Tag Image Id Size
---------------------------------------------------------------------------
webapp-gui_app_1_1b87619cd08b webapp-gui_app latest f0982b82c556 467 MB
webapp-gui_db_1_bd74de835067 mysql 5.7 702fb0b7837f 355 MB
On my webapp, the ping command is not allowing me to ping by hostname, so when I try to run interactive mode to troubleshoot I noticed that when running with:
docker run -it webapp-gui_app_1_1b87619cd08b /bin/sh
This gives the correct resolv.conf and I am able to successfully ping the hostnames, however, when I run it like this
docker exec -u 0 -it webapp-gui_app_1_1b87619cd08b sh
My resolv.conf file changes to the following (incorrect resolv.conf), and I am not able to ping other local machines by hostname anymore. Does anyone know why?
/etc # cat resolv.conf
search mydomain.com
nameserver 127.0.0.11
options ndots:0
docker docker-compose hostname
docker docker-compose hostname
asked Nov 21 at 0:04
user10067412
988
asked Nov 21 at 0:04
user10067412
988
asked Nov 21 at 0:04
user10067412
988
asked Nov 21 at 0:04
user10067412
988
asked Nov 21 at 0:04
user10067412
988
988
add a comment |
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