build 建立 Image

1. 把使用的原始image及要修改的內容依 Dockerfile 語法寫入檔案，以下例子使用 registry.csie.cyut.edu.tw/rsyslog image 在其 /etc/rsyslog.conf 增加一行，將local4.*的訊息記錄到 /var/log/journal/podmanfile.log。

   [deyu5@kvm4 ~]# vim Podmanfile
   [deyu5@kvm4 ~]# cat Podmanfile
   FROM registry.csie.cyut.edu.tw/rsyslog
   MAINTAINER dywang@csie.cyut.edu.tw
   
   RUN echo 'local4.*     /var/log/journal/podmanfile.log' >> /etc/rsyslog.conf
   

2. 使用本地端的 Podmanfile 建立名為 pmrsyslog 的 image。

   [deyu5@kvm4 ~]$ podman build --tag=pmrsyslog --file Podmanfile
   STEP 1/3: FROM registry.csie.cyut.edu.tw/rsyslog
   STEP 2/3: MAINTAINER dywang@csie.cyut.edu.tw
   --> Using cache 54f5812ec2a59f41288c5f32d648b938556489f89da12ff4af2541947e3cb44c
   --> 54f5812ec2a
   STEP 3/3: RUN echo 'local4.*     /var/log/journal/podmanfile.log' >> /etc/rsyslog.conf
   --> Using cache 9fe0c3653d3f6b0e7d83ab95939c3abb9885b5068d03097beb2f443857982d9b
   COMMIT pmrsyslog
   --> 9fe0c3653d3
   Successfully tagged localhost/pmrsyslog:latest
   Successfully tagged localhost/myrsyslog:latest
   9fe0c3653d3f6b0e7d83ab95939c3abb9885b5068d03097beb2f443857982d9b
   

3. 使用遠端 URL 的 Podmanfile 建立名為 myrsyslog 的 image。

   [deyu5@kvm4 ~]$ podman build --tag=myrsyslog \
   http://dywang.csie.cyut.edu.tw/materials/Podmanfile
   STEP 1/3: FROM registry.csie.cyut.edu.tw/rsyslog
   Trying to pull registry.csie.cyut.edu.tw/rsyslog:latest...
   Getting image source signatures
   Copying blob 8104e5e36684 done
   Copying blob bc8ac9851443 done
   Copying blob 745ce1c08bfe done
   Copying blob 718cd6a65a88 done
   Copying config 8411a1edd4 done
   Writing manifest to image destination
   Storing signatures
   STEP 2/3: MAINTAINER dywang@csie.cyut.edu.tw
   --> 54f5812ec2a
   STEP 3/3: RUN echo 'local4.*     /var/log/journal/podmanfile.log' >> /etc/rsyslog.conf
   COMMIT myrsyslog
   --> 9fe0c3653d3
   Successfully tagged localhost/myrsyslog:latest
   9fe0c3653d3f6b0e7d83ab95939c3abb9885b5068d03097beb2f443857982d9b
   

4. 查詢 images，本地端已建立了 pmrsyslog 及 myrsyslog 兩個 images。

   [deyu5@kvm4 ~]$ podman images
   REPOSITORY                 TAG         IMAGE ID      CREATED         SIZE
   localhost/pmrsyslog        latest      9fe0c3653d3f  21 minutes ago  20 MB
   localhost/myrsyslog        latest      9fe0c3653d3f  21 minutes ago  20 MB