This dashboard, which includes information for all age groups, has been updated through February 2022. Updated pediatricseroprevalence information from March 2022 is available here. CDC currently plans to endthe nationwide SARS-CoV-2 antibody studies in December 2022.
Docker can build images automatically by reading the instructions from aDockerfile. A Dockerfile is a text document that contains all the commands auser could call on the command line to assemble an image. This page describesthe commands you can use in a Dockerfile.
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Docker runs instructions in a Dockerfile in order. A Dockerfile mustbegin with a FROM instruction. This may be afterparserdirectives,comments, and globally scopedARGs. The FROM instruction specifies theparentimageopen_in_new from which you arebuilding. FROM may only be preceded by one or more ARG instructions, whichdeclare arguments that are used in FROM lines in the Dockerfile.
Consider the following example which would fail in a non-obvious way onWindows. The second \ at the end of the second line would be interpreted as anescape for the newline, instead of a target of the escape from the first \.Similarly, the \ at the end of the third line would, assuming it was actuallyhandled as an instruction, cause it be treated as a line continuation. The resultof this Dockerfile is that second and third lines are considered a singleinstruction:
When adding files or directories that contain special characters (such as [and ]), you need to escape those paths following the Golang rules to preventthem from being treated as a matching pattern. For example, to add a filenamed arr[0].txt, use the following;
All new files and directories are created with a UID and GID of 0, unless theoptional --chown flag specifies a given username, groupname, or UID/GIDcombination to request specific ownership of the content added. Theformat of the --chown flag allows for either username and groupname stringsor direct integer UID and GID in any combination. Providing a username withoutgroupname or a UID without GID will use the same numeric UID as the GID. If ausername or groupname is provided, the container's root filesystem/etc/passwd and /etc/group files will be used to perform the translationfrom name to integer UID or GID respectively. The following examples showvalid definitions for the --chown flag:
In the case where is a remote file URL, the destination willhave permissions of 600. If the remote file being retrieved has an HTTPLast-Modified header, the timestamp from that header will be usedto set the mtime on the destination file. However, like any other fileprocessed during an ADD, mtime isn't included in the determinationof whether or not the file has changed and the cache should be updated.
The path must be inside the build context;you can't use COPY ../something /something, because the builder can onlyaccess files from the context, and ../something specifies a parent file ordirectory of the build context root.
If is a URL and does end with a trailing slash, then thefilename is inferred from the URL and the file is downloaded to/. For instance, ADD / wouldcreate the file /foobar. The URL must have a nontrivial path so that anappropriate filename can be discovered in this case ( 't work).
If is a local tar archive in a recognized compression format(identity, gzip, bzip2 or xz) then it's unpacked as a directory. Resourcesfrom remote URLs aren't decompressed. When a directory is copied orunpacked, it has the same behavior as tar -x. The result is the union of:
When copying files or directories that contain special characters (such as [and ]), you need to escape those paths following the Golang rules to preventthem from being treated as a matching pattern. For example, to copy a filenamed arr[0].txt, use the following;
All new files and directories are created with a UID and GID of 0, unless theoptional --chown flag specifies a given username, groupname, or UID/GIDcombination to request specific ownership of the copied content. Theformat of the --chown flag allows for either username and groupname stringsor direct integer UID and GID in any combination. Providing a username withoutgroupname or a UID without GID will use the same numeric UID as the GID. If ausername or groupname is provided, the container's root filesystem/etc/passwd and /etc/group files will be used to perform the translationfrom name to integer UID or GID respectively. The following examples showvalid definitions for the --chown flag:
Optionally COPY accepts a flag --from= that can be used to setthe source location to a previous build stage (created with FROM .. AS )that will be used instead of a build context sent by the user. In case a buildstage with a specified name can't be found an image with the same name isattempted to be used instead.
Use --link to reuse already built layers in subsequent builds with--cache-from even if the previous layers have changed. This is especiallyimportant for multi-stage builds where a COPY --from statement wouldpreviously get invalidated if any previous commands in the same stage changed,causing the need to rebuild the intermediate stages again. With --link thelayer the previous build generated is reused and merged on top of the newlayers. This also means you can easily rebase your images when the base imagesreceive updates, without having to execute the whole build again. In backendsthat support it, BuildKit can do this rebase action without the need to push orpull any layers between the client and the registry. BuildKit will detect thiscase and only create new image manifest that contains the new layers and oldlayers in correct order.
When using --link the COPY/ADD commands are not allowed to read any filesfrom the previous state. This means that if in previous state the destinationdirectory was a path that contained a symlink, COPY/ADD can not follow it.In the final image the destination path created with --link will always be apath containing only directories.
The shell form of ENTRYPOINT prevents any CMD command line arguments frombeing used. It also starts your ENTRYPOINT as a subcommand of /bin/sh -c,which does not pass signals. This means that the executable will not be thecontainer's PID 1, and will not receive Unix signals. In this case, yourexecutable doesn't receive a SIGTERM from docker stop .
The VOLUME instruction creates a mount point with the specified nameand marks it as holding externally mounted volumes from native host or othercontainers. The value can be a JSON array, VOLUME ["/var/log/"], or a plainstring with multiple arguments, such as VOLUME /var/log or VOLUME /var/log /var/db. For more information/examples and mounting instructions via theDocker client, refer toShare Directories via Volumesopen_in_newdocumentation.
The host directory is declared at container run-time: The host directory(the mountpoint) is, by its nature, host-dependent. This is to preserve imageportability, since a given host directory can't be guaranteed to be availableon all hosts. For this reason, you can't mount a host directory fromwithin the Dockerfile. The VOLUME instruction does not support specifying a host-dirparameter. You must specify the mountpoint when you create or run the container.
In this case, the RUN instruction uses v1.0.0 instead of the ARG settingpassed by the user:v2.0.1 This behavior is similar to a shellscript where a locally scoped variable overrides the variables passed asarguments or inherited from environment, from its point of definition.
The variable expansion technique in this example allows you to pass argumentsfrom the command line and persist them in the final image by leveraging theENV instruction. Variable expansion is only supported fora limited set ofDockerfile instructions.
By default, these pre-defined variables are excluded from the output ofdocker history. Excluding them reduces the risk of accidentally leakingsensitive authentication information in an HTTP_PROXY variable.
ARG variables are not persisted into the built image as ENV variables are.However, ARG variables do impact the build cache in similar ways. If aDockerfile defines an ARG variable whose value is different from a previousbuild, then a "cache miss" occurs upon its first usage, not its definition. Inparticular, all RUN instructions following an ARG instruction use the ARGvariable implicitly (as an environment variable), thus can cause a cache miss.All predefined ARG variables are exempt from caching unless there is amatching ARG statement in the Dockerfile.
Publication 15PDF provides information on employer tax responsibilities related to taxable wages, employment tax withholding and which tax returns must be filed. More complex issues are discussed in Publication 15-APDF and tax treatment of many employee benefits can be found in Publication 15. We recommend employers download these publications from IRS.gov. Copies can be requested online (search "Forms and Publications) or by calling 800-TAX-FORM.
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