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ctnr - rootless runc-based container engine

  •    Go

ctnr is a CLI built on top of runc to manage and build OCI images as well as containers on Linux. ctnr aims to ease system container creation and execution as unprivileged user. Also ctnr is a tool to experiment with runc features. Container networking is limited. With plain ctnr/runc only the host network can be used. The standard CNI plugins require root privileges. One workaround is to map ports on the host network using PRoot* accepting bad performance. A better solution is to use slirp4netns which emulates the TCP/IP stack in a user namespace efficiently. It can be used with ctnr via the slirp-cni-plugin. Once container initialization is also moved into a user namespace with slirp the standard CNI plugins can be used again. For instance the bridge can be used to achieve communication between containers (see user-mode networking).






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