Taking a look at the podman-run man page, we can see the new -tz option: $ man podman-run The reserved word local sets the time zone to match your host machine's time zone. The -tz flag takes IANA time zones as well as local. Given all that, there was no easy way to change the system to cause ALL containers to use the desired time zone. For example, Fedora images accept the environment variable, while Alpine images ignore it entirely.Īdditionally, some time zones even share the same abbreviation, such as CST standing both for Central Standard time (in the US) and China Standard time. The TZ environment variable is also a problem since not all services pay attention to the variable, causing users to become confused due to different outcomes to the same setting. These attempts have caused problems since the /etc/localtime file is often a symbolic link and may not do what the user expects. Users have attempted to fix this by mounting the time zone file from the host into the container or by adding an environment variable like TZ=jst. This means that your container running in Tokyo could be reporting that it is running in New York City, depending on where the image was built. Once the image is pulled, the container engine just launches the container based on the hardcoded time zone. There is no installation process to modify the time zone. Usually, the time zone is set to the location where the image or base image was built, or to UTC☐0:00. This image is built with a hardcoded link from /etc/localtime to one time zone. When container engines like Podman, Docker, or CRI-O run containers, they pull down the specified OCI image from a container registry. Wed 04:58:59 AM JST Problem: Container images have an embedded time zone If I force a change to this file to point at Japan, the way the date is reported changes: $ ln -fs.
When you ask the system what time it is, the glibc library reads this link to display the time based on the time zone.
On my Fedora machine, I see the following link: $ ls -l /etc/localtime
#Docker utc time zone install#
Traditionally, Linux computer systems are installed on a physical or virtual machine, and one of the questions asked during the install is: What time zone is the machine is running in? The installer sets up a link between /etc/localtime and a time zone file. A practical introduction to container terminology.
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