Merge pull request #981 from kubernetes-incubator/revert-911-DROP_CAPS

Revert "Drop linux capabilities and rework users/groups"

docs/security.md

@@ -1,31 +0,0 @@
-Users and groups
-================
-
-There are following users and groups defined by the addusers role:
-
-* Kube user, group from the ``kubelet_user`` and ``kubelet_group`` vars.
-* Etcd user, group from the ``etcd_user`` and ``etcd_group`` vars.
-* Network plugin user, group from the ``netplug_user`` and ``netplug_group`` vars.
-
-There are additional certificate access groups for kube and etcd users defined.
-For example, kubelet and network plugins require read access to the
-etcd certs and keys. This is defined via the corresponding ``etcd_cert_group``
-var. Members of that group (defaults to `kube` and `netplug` users) will read
-etcd secret keys and certs. Same applies to the ``kube_cert_group``
-(defaults to `kube` user) members. You may want to share kube certs via that
-group with bastion proxies or the like.
-
-Linux capabilites
-=================
-
-Kargo allows to control dropped Linux capabilities for unprivileged docker
-containers it configures for deployments. For examle, etcd or some networking
-related systemd units or k8s workloads, like kubedns, dnsmasq or netchecker apps.
-
-Dropped capabilites are represented by the ``apps_drop_cap``, ``dnsmasq_drop_cap``,
-``etcd_drop_cap``, ``calico_drop_cap``  vars.
-
-Be carefull changing defaults - different kube components and k8s apps might
-expect specific capabilities to be present and can only run as root! Also note
-that kublet, kube-proxy and network plugins require privileged mode and ignore
-dropped capabilities.

inventory/group_vars/all.yml

@@ -36,19 +36,10 @@ retry_stagger: 5
 # Directory where python binary is installed
 # ansible_python_interpreter: "/opt/bin/python"
 
-# This is the users/groups to own files and groups that the cert creation
-# scripts chgrp the cert files to
-kubelet_user: kube
-kubelet_group: kube
+# This is the group that the cert creation scripts chgrp the
+# cert files to. Not really changable...
 kube_cert_group: kube-cert
 
-netplug_user: netplug
-netplug_group: netplug
-
-etcd_user: etcd
-etcd_group: etcd
-etcd_cert_group: etcd-cert
-
 # Cluster Loglevel configuration
 kube_log_level: 2
 

roles/adduser/defaults/main.yml

@@ -1,40 +1,24 @@
 ---
 addusers:
   etcd:
-    name: "{{ etcd_user }}"
+    name: etcd
     comment: "Etcd user"
-    createhome: >-
-      {% if ansible_os_family in ["CoreOS", "Container Linux by CoreOS"] %}no{% else %}yes{% endif %}
+    createhome: yes
     home: "/var/lib/etcd"
     system: yes
-    shell: /usr/sbin/nologin
-    group: "{{ etcd_group }}"
-    groups: "{{ etcd_cert_group }}"
-    type: >-
-      {% if ansible_os_family in ["CoreOS", "Container Linux by CoreOS"] %}cloud-init{% endif %}
+    shell: /bin/nologin
   kube:
-    name: "{{ kubelet_user }}"
+    name: kube
     comment: "Kubernetes user"
-    shell: /usr/sbin/nologin
+    shell: /sbin/nologin
     system: yes
-    group: "{{ kubelet_group }}"
-    groups: "{{ etcd_cert_group }},{{ kube_cert_group }}"
+    group: "{{ kube_cert_group }}"
     createhome: no
-  netplug:
-    name: "{{ netplug_user }}"
-    comment: "Network plugin user"
-    createhome: no
-    system: yes
-    shell: /usr/sbin/nologin
-    group: "{{ netplug_group }}"
-    groups: "{{ etcd_cert_group }}"
 
 adduser:
   name: "{{ user.name }}"
   group: "{{ user.name|default(None) }}"
-  groups: "{{ user.groups|default(None) }}"
   comment: "{{ user.comment|default(None) }}"
   shell: "{{ user.shell|default(None) }}"
   system: "{{ user.system|default(None) }}"
   createhome: "{{ user.createhome|default(None) }}"
-  type: "{{ user.type|default(None) }}"

roles/adduser/handlers/main.yml

@@ -1,4 +0,0 @@
----
-- name:  User | update users for cloud-init
-  command: /usr/bin/coreos-cloudinit --from-file /etc/{{ user.name }}_user_cloud_init_conf
-  when: ansible_os_family in ["CoreOS", "Container Linux by CoreOS"]

roles/adduser/tasks/main.yml

@@ -1,35 +1,13 @@
 ---
-- name: User | Create Certificate Access Groups
-  group: name={{ item }} system=yes
-  with_items: "{{ user.groups.split(',') }}"
-
 - name: User | Create User Group
   group: name={{user.group|default(user.name)}} system={{user.system|default(omit)}}
 
-- name: User | Create cloud-init user
-  template:
-    dest: /etc/{{ user.name }}_user_cloud_init_conf
-    src: users.j2
-    owner: root
-    mode: 0640
-  notify: User | update users for cloud-init
-  when: "{{ user.type|default('standard') == 'cloud-init' }}"
-
-- meta: flush_handlers
-
-- name: User | Hack groups for existing cloud-init users CoreOS
-  command: /usr/sbin/usermod -aG {{ item }} {{ user.name }}
-  with_items: "{{ user.groups.split(',') }}"
-  when: "{{ ansible_os_family in ['CoreOS', 'Container Linux by CoreOS'] and user.type|default('standard') == 'cloud-init' }}"
-
 - name: User | Create User
   user:
     comment: "{{user.comment|default(omit)}}"
-    createhome: "{{user.createhome|default(omit)}}"
+    createhome: "{{user.create_home|default(omit)}}"
     group: "{{user.group|default(user.name)}}"
-    groups: "{{user.groups|default(omit)}}"
     home: "{{user.home|default(omit)}}"
     shell: "{{user.shell|default(omit)}}"
     name: "{{user.name}}"
     system: "{{user.system|default(omit)}}"
-  when: "{{ user.type|default('standard') != 'cloud-init' }}"

roles/adduser/templates/users.j2

@@ -1,15 +0,0 @@
-#cloud-config
-users:
-- name: {{ user.name  }}
-  gecos: {{ user.comment }}
-  system: {{ user.system|bool }}
-  no-log-init: {{ user.system|bool }}
-  primary-group: {{ user.group }}
-  no-create-home: {{ not user.createhome|bool }}
-  homedir: {{ user.home }}
-  shell: {{ user.shell }}
-  groups: |
-    {% for g in user.groups.split(',') %}
-    - {{ g }}
-    {% endfor %}
-    #

roles/adduser/vars/coreos.yml

@@ -0,0 +1,8 @@
+---
+addusers:
+  - name: kube
+    comment: "Kubernetes user"
+    shell: /sbin/nologin
+    system: yes
+    group: "{{ kube_cert_group }}"
+    createhome: no

roles/adduser/vars/debian.yml

@@ -0,0 +1,15 @@
+---
+addusers:
+  - name: etcd
+    comment: "Etcd user"
+    createhome: yes
+    home: "/var/lib/etcd"
+    system: yes
+    shell: /bin/nologin
+
+  - name: kube
+    comment: "Kubernetes user"
+    shell: /sbin/nologin
+    system: yes
+    group: "{{ kube_cert_group }}"
+    createhome: no

roles/adduser/vars/redhat.yml

@@ -0,0 +1,15 @@
+---
+addusers:
+  - name: etcd
+    comment: "Etcd user"
+    createhome: yes
+    home: "/var/lib/etcd"
+    system: yes
+    shell: /bin/nologin
+
+  - name: kube
+    comment: "Kubernetes user"
+    shell: /sbin/nologin
+    system: yes
+    group: "{{ kube_cert_group }}"
+    createhome: no

roles/dnsmasq/defaults/main.yml

@@ -26,16 +26,3 @@ dns_cpu_limit: 100m
 dns_memory_limit: 170Mi
 dns_cpu_requests: 70m
 dns_memory_requests: 70Mi
-
-# Linux capabilities to be dropped for dnsmasq k8s app ran container engines
-dnsmasq_drop_cap:
-  - chown
-  - dac_override
-  - fowner
-  - fsetid
-  - kill
-  - setpcap
-  - sys_chroot
-  - mknod
-  - audit_write
-  - setfcap

roles/dnsmasq/templates/dnsmasq-ds.yml

@@ -26,10 +26,6 @@ spec:
             capabilities:
               add:
                 - NET_ADMIN
-              drop:
-{% for c in dnsmasq_drop_cap %}
-                - {{ c.upper() }}
-{% endfor %}
           imagePullPolicy: IfNotPresent
           resources:
             limits:

roles/etcd/defaults/main.yml

@@ -3,26 +3,10 @@ etcd_bin_dir: "{{ local_release_dir }}/etcd/etcd-{{ etcd_version }}-linux-amd64/
 
 etcd_config_dir: /etc/ssl/etcd
 etcd_cert_dir: "{{ etcd_config_dir }}/ssl"
+etcd_cert_group: root
 
 etcd_script_dir: "{{ bin_dir }}/etcd-scripts"
 
-# Linux capabilities to be dropped for container engines
-etcd_drop_cap:
-  - chown
-  - dac_override
-  - fowner
-  - fsetid
-  - kill
-  - setgid
-  - setuid
-  - setpcap
-  - net_bind_service
-  - net_raw
-  - sys_chroot
-  - mknod
-  - audit_write
-  - setfcap
-
 # Limits
 etcd_memory_limit: 512M
 etcd_cpu_limit: 300m

roles/etcd/files/make-ssl-etcd.sh

@@ -94,8 +94,5 @@ if [ -n "$HOSTS" ]; then
     done
 fi
 
-# Grant the group read access
-chmod g+r *.pem
-
 # Install certs
 mv *.pem ${SSLDIR}/

roles/etcd/meta/main.yml

@@ -2,7 +2,7 @@
 dependencies:
   - role: adduser
     user: "{{ addusers.etcd }}"
-    tags: bootstrap-os
+    when: not ansible_os_family in ['CoreOS', 'Container Linux by CoreOS']
   - role: download
     file: "{{ downloads.etcd }}"
     tags: download

roles/etcd/tasks/gen_certs.yml

@@ -4,15 +4,14 @@
     path={{ etcd_cert_dir }}
     group={{ etcd_cert_group }}
     state=directory
-    mode=0750
-    owner={{ etcd_user }}
+    owner=root
     recurse=yes
 
 - name: "Gen_certs | create etcd script dir (on {{groups['etcd'][0]}})"
   file:
     path: "{{ etcd_script_dir }}"
     state: directory
-    owner: "{{ etcd_user }}"
+    owner: root
   run_once: yes
   delegate_to: "{{groups['etcd'][0]}}"
 
@@ -21,8 +20,7 @@
     path={{ etcd_cert_dir }}
     group={{ etcd_cert_group }}
     state=directory
-    mode=0750
-    owner={{ etcd_user }}
+    owner=root
     recurse=yes
   run_once: yes
   delegate_to: "{{groups['etcd'][0]}}"
@@ -126,12 +124,12 @@
     path={{ etcd_cert_dir }}
     group={{ etcd_cert_group }}
     state=directory
-    owner={{ etcd_user }}
+    owner=kube
     recurse=yes
   tags: facts
 
-- name: Gen_certs | set shared group permissions on keys
-  shell: chmod 0640 {{ etcd_cert_dir}}/*.pem
+- name: Gen_certs | set permissions on keys
+  shell: chmod 0600 {{ etcd_cert_dir}}/*key.pem
   when: inventory_hostname in groups['etcd']
   changed_when: false
 

roles/etcd/tasks/main.yml

@@ -1,8 +1,6 @@
 ---
 - include: pre_upgrade.yml
   tags: etcd-pre-upgrade
-- include: set_facts.yml
-  tags: [bootstrap-os, facts]
 - include: check_certs.yml
   tags: [etcd-secrets, facts]
 - include: gen_certs.yml

roles/etcd/tasks/pre_upgrade.yml

@@ -1,4 +1,3 @@
----
 - name: "Pre-upgrade | check for etcd-proxy unit file"
   stat:
     path: /etc/systemd/system/etcd-proxy.service
@@ -50,7 +49,3 @@
     awk -F"[: =]" '{print "{{ bin_dir }}/etcdctl --peers={{ etcd_access_addresses | regex_replace('https','http') }} member update "$1" https:"$7":"$8}' | bash
   run_once: true
   when: 'etcd_member_list.rc == 0 and "http://" in etcd_member_list.stdout'
-
-- name: "Pre-upgrade | share access to etcd certs for its users"
-  shell: chmod g+r {{ etcd_cert_dir }}/*.pem
-  failed_when: false

roles/etcd/tasks/set_facts.yml

@@ -1,17 +0,0 @@
----
-- name: Etcd | get etcd user ID
-  shell: /usr/bin/id -u {{ etcd_user }} || echo 0
-  register: etcd_uid
-
-- name: Etcd | get etcd group ID
-  shell: /usr/bin/getent group {{ etcd_group }} | cut -d':' -f3 || echo 0
-  register: etcd_gid
-
-- name: Etcd | get etcd cert group ID
-  shell: /usr/bin/getent group {{ etcd_cert_group }} | cut -d':' -f3 || echo 0
-  register: etcd_cert_gid
-
-- set_fact:
-    etcd_user_id: "{{ etcd_uid.stdout }}"
-    etcd_group_id: "{{ etcd_gid.stdout }}"
-    etcd_cert_group_id: "{{ etcd_cert_gid.stdout }}"

roles/etcd/templates/etcd-docker.service.j2

@@ -14,12 +14,8 @@ ExecStart={{ docker_bin_dir }}/docker run --restart=on-failure:5 \
 -v /etc/ssl/certs:/etc/ssl/certs:ro \
 -v {{ etcd_cert_dir }}:{{ etcd_cert_dir }}:ro \
 -v /var/lib/etcd:/var/lib/etcd:rw \
-{% for c in etcd_drop_cap %}
---cap-drop={{ c }} \
-{% endfor %}
 --memory={{ etcd_memory_limit|regex_replace('Mi', 'M') }} --cpu-shares={{ etcd_cpu_limit|regex_replace('m', '') }} \
 --name={{ etcd_member_name | default("etcd") }} \
--u {{ etcd_user_id }}:{{ etcd_group_id }} --group-add {{ etcd_cert_group_id }} \
 {{ etcd_image_repo }}:{{ etcd_image_tag }} \
 {% if etcd_after_v3 %}
 {{ etcd_container_bin_dir }}etcd

roles/etcd/templates/etcd-rkt.service.j2

@@ -8,9 +8,6 @@ Restart=on-failure
 RestartSec=10s
 TimeoutStartSec=0
 LimitNOFILE=40000
-User=root
-Group={{ etcd_group_id }}
-SupplementaryGroups={{ etcd_cert_group_id }}
 
 ExecStart=/usr/bin/rkt run \
 --uuid-file-save=/var/run/etcd.uuid \
@@ -23,11 +20,6 @@ ExecStart=/usr/bin/rkt run \
 --set-env-file=/etc/etcd.env \
 --stage1-from-dir=stage1-fly.aci \
 {{ etcd_image_repo }}:{{ etcd_image_tag }} \
-{% for c in etcd_drop_cap %}
---caps-remove=CAP_{{ c.upper() }} \
-{% endfor %}
---memory={{ etcd_memory_limit }} --cpu={{ etcd_cpu_limit }} \
---user={{ etcd_user_id }} --group={{ etcd_group_id }} \
 --name={{ etcd_member_name | default("etcd") }}
 
 ExecStartPre=-/usr/bin/rkt rm --uuid-file=/var/run/etcd.uuid

roles/kubernetes-apps/ansible/defaults/main.yml

@@ -51,18 +51,3 @@ netchecker_kubectl_memory_requests: 64M
 etcd_cert_dir: "/etc/ssl/etcd/ssl"
 calico_cert_dir: "/etc/calico/certs"
 canal_cert_dir: "/etc/canal/certs"
-
-# Linux capabilities to be dropped for k8s apps ran by container engines
-apps_drop_cap:
-  - chown
-  - dac_override
-  - fowner
-  - fsetid
-  - kill
-  - setgid
-  - setuid
-  - setpcap
-  - sys_chroot
-  - mknod
-  - audit_write
-  - setfcap

roles/kubernetes-apps/ansible/templates/calico-policy-controller.yml.j2

@@ -25,12 +25,6 @@ spec:
         - name: calico-policy-controller
           image: {{ calico_policy_image_repo }}:{{ calico_policy_image_tag }}
           imagePullPolicy: {{ k8s_image_pull_policy }}
-          securityContext:
-            capabilities:
-              drop:
-{% for c in apps_drop_cap %}
-                - {{ c.upper() }}
-{% endfor %}
           resources:
             limits:
               cpu: {{ calico_policy_controller_cpu_limit }}

roles/kubernetes-apps/ansible/templates/netchecker-agent-ds.yml

@@ -23,12 +23,6 @@ spec:
             - name: REPORT_INTERVAL
               value: '{{ agent_report_interval }}'
           imagePullPolicy: {{ k8s_image_pull_policy }}
-          securityContext:
-            capabilities:
-              drop:
-{% for c in apps_drop_cap %}
-                - {{ c.upper() }}
-{% endfor %}
           resources:
             limits:
               cpu: {{ netchecker_agent_cpu_limit }}

roles/kubernetes-apps/ansible/templates/netchecker-agent-hostnet-ds.yml

@@ -24,12 +24,6 @@ spec:
             - name: REPORT_INTERVAL
               value: '{{ agent_report_interval }}'
           imagePullPolicy: {{ k8s_image_pull_policy }}
-          securityContext:
-            capabilities:
-              drop:
-{% for c in apps_drop_cap %}
-                - {{ c.upper() }}
-{% endfor %}
           resources:
             limits:
               cpu: {{ netchecker_agent_cpu_limit }}

roles/kubernetes-apps/ansible/templates/netchecker-server-pod.yml

@@ -33,9 +33,3 @@ spec:
           memory: {{ netchecker_kubectl_memory_requests }}
       args:
         - proxy
-      securityContext:
-        capabilities:
-          drop:
-{% for c in apps_drop_cap %}
-            - {{ c.upper() }}
-{% endfor %}

roles/kubernetes/master/defaults/main.yml

@@ -13,21 +13,6 @@ kube_apiserver_node_port_range: "30000-32767"
 etcd_config_dir: /etc/ssl/etcd
 etcd_cert_dir: "{{ etcd_config_dir }}/ssl"
 
-# Linux capabilities to be dropped for k8s apps ran by container engines
-apps_drop_cap:
-  - chown
-  - dac_override
-  - fowner
-  - fsetid
-  - kill
-  - setgid
-  - setuid
-  - setpcap
-  - sys_chroot
-  - mknod
-  - audit_write
-  - setfcap
-
 # Limits for kube components
 kube_controller_memory_limit: 512M
 kube_controller_cpu_limit: 250m

roles/kubernetes/master/tasks/main.yml

@@ -2,9 +2,6 @@
 - include: pre-upgrade.yml
   tags: k8s-pre-upgrade
 
-- include: set_facts.yml
-  tags: facts
-
 - name: Copy kubectl from hyperkube container
   command: "{{ docker_bin_dir }}/docker run --rm -v {{ bin_dir }}:/systembindir {{ hyperkube_image_repo }}:{{ hyperkube_image_tag }} /bin/cp /hyperkube /systembindir/kubectl"
   register: kube_task_result

roles/kubernetes/master/tasks/set_facts.yml

@@ -1,22 +0,0 @@
----
-- name: Master | get kube user ID
-  shell: /usr/bin/id -u {{ kubelet_user }} || echo 0
-  register: kube_uid
-
-- name: Master | get kube group ID
-  shell: /usr/bin/getent group {{ kubelet_group }} | cut -d':' -f3 || echo 0
-  register: kube_gid
-
-- name: Master | get kube cert group ID
-  shell: /usr/bin/getent group {{ kube_cert_group }} | cut -d':' -f3 || echo 0
-  register: kube_cert_gid
-
-- name: Master | get etcd cert group ID
-  shell: /usr/bin/getent group {{ etcd_cert_group }} | cut -d':' -f3 || echo 0
-  register: etcd_cert_gid
-
-- set_fact:
-    kubelet_user_id: "{{ kube_uid.stdout }}"
-    kubelet_group_id: "{{ kube_gid.stdout }}"
-    kube_cert_group_id: "{{ kube_cert_gid.stdout }}"
-    etcd_cert_group_id: "{{ etcd_cert_gid.stdout }}"

roles/kubernetes/master/templates/manifests/kube-apiserver.manifest.j2

@@ -12,14 +12,6 @@ spec:
   - name: kube-apiserver
     image: {{ hyperkube_image_repo }}:{{ hyperkube_image_tag }}
     imagePullPolicy: {{ k8s_image_pull_policy }}
-    securityContext:
-      capabilities:
-        drop:
-{% for c in apps_drop_cap %}
-          - {{ c.upper() }}
-{% endfor %}
-        add:
-          - DAC_OVERRIDE
     resources:
       limits:
         cpu: {{ kube_apiserver_cpu_limit }}

roles/kubernetes/master/templates/manifests/kube-controller-manager.manifest.j2

@@ -11,17 +11,6 @@ spec:
   - name: kube-controller-manager
     image: {{ hyperkube_image_repo }}:{{ hyperkube_image_tag }}
     imagePullPolicy: {{ k8s_image_pull_policy }}
-    securityContext:
-      runAsUser: {{ kubelet_user_id }}
-      fsGroup: {{ kubelet_group_id }}
-      supplementalGroups:
-        - {{ kube_cert_group_id }}
-        - {{ etcd_cert_group_id }}
-      capabilities:
-        drop:
-{% for c in apps_drop_cap %}
-          - {{ c.upper() }}
-{% endfor %}
     resources:
       limits:
         cpu: {{ kube_controller_cpu_limit }}

roles/kubernetes/master/templates/manifests/kube-scheduler.manifest.j2

@@ -11,17 +11,6 @@ spec:
   - name: kube-scheduler
     image: {{ hyperkube_image_repo }}:{{ hyperkube_image_tag }}
     imagePullPolicy: {{ k8s_image_pull_policy }}
-    securityContext:
-      runAsUser: {{ kubelet_user_id }}
-      fsGroup: {{ kubelet_group_id }}
-      supplementalGroups:
-        - {{ kube_cert_group_id }}
-        - {{ etcd_cert_group_id }}
-      capabilities:
-        drop:
-{% for c in apps_drop_cap %}
-          - {{ c.upper() }}
-{% endfor %}
     resources:
       limits:
         cpu: {{ kube_scheduler_cpu_limit }}

roles/kubernetes/node/defaults/main.yml

@@ -29,18 +29,3 @@ nginx_image_repo: nginx
 nginx_image_tag: 1.11.4-alpine
 
 etcd_config_dir: /etc/ssl/etcd
-
-# Linux capabilities to be dropped for container engines
-apps_drop_cap:
-  - chown
-  - dac_override
-  - fowner
-  - fsetid
-  - kill
-  - setgid
-  - setuid
-  - setpcap
-  - sys_chroot
-  - mknod
-  - audit_write
-  - setfcap

roles/kubernetes/node/tasks/install.yml

@@ -26,6 +26,6 @@
   notify: restart kubelet
 
 - name: install | Install kubelet launch script
-  template: src=kubelet-container.j2 dest="{{ bin_dir }}/kubelet" owner={{ kubelet_user }} mode=0755 backup=yes
+  template: src=kubelet-container.j2 dest="{{ bin_dir }}/kubelet" owner=kube mode=0755 backup=yes
   notify: restart kubelet
   when: kubelet_deployment_type == "docker"

roles/kubernetes/node/tasks/main.yml

@@ -4,9 +4,6 @@
       {%- if inventory_hostname in groups['kube-master'] and inventory_hostname not in groups['kube-node'] -%}true{%- else -%}false{%- endif -%}
   tags: facts
 
-- include: pre-upgrade.yml
-  tags: k8s-pre-upgrade
-
 - include: install.yml
   tags: kubelet
 

roles/kubernetes/node/tasks/pre-upgrade.yml

@@ -1,4 +0,0 @@
----
-- name: "Pre-upgrade | share access to kube certs for its users"
-  shell: chmod g+r {{ kube_cert_dir }}/*.pem
-  failed_when: false

roles/kubernetes/node/templates/kubelet.rkt.service.j2

@@ -29,7 +29,7 @@ ExecStart=/usr/bin/rkt run \
         --volume run,kind=host,source=/run,readOnly=false \
         --volume usr-share-certs,kind=host,source=/usr/share/ca-certificates,readOnly=true \
         --volume var-lib-docker,kind=host,source={{ docker_daemon_graph }},readOnly=false \
-        --volume var-lib-kubelet,kind=host,source=/var/lib/kubelet,readOnly=false \
+	--volume var-lib-kubelet,kind=host,source=/var/lib/kubelet,readOnly=false \
         --volume var-log,kind=host,source=/var/log \
         --mount volume=dns,target=/etc/resolv.conf \
         --mount volume=etc-cni,target=/etc/cni \
@@ -44,7 +44,6 @@ ExecStart=/usr/bin/rkt run \
         --mount volume=var-log,target=/var/log \
         --stage1-from-dir=stage1-fly.aci \
         {{ hyperkube_image_repo }}:{{ hyperkube_image_tag }} \
-        --memory={{ kubelet_memory_limit }} --cpu={{ kubelet_cpu_limit }} \
         --uuid-file-save=/var/run/kubelet.uuid \
         --debug --exec=/kubelet -- \
                 $KUBE_LOGTOSTDERR \

roles/kubernetes/preinstall/meta/main.yml

@@ -2,7 +2,4 @@
 dependencies:
   - role: adduser
     user: "{{ addusers.kube }}"
-    tags: [bootstrap-os, kubelet]
-  - role: adduser
-    user: "{{ addusers.netplug }}"
-    tags: [bootstrap-os, network]
+    tags: kubelet

roles/kubernetes/preinstall/tasks/main.yml

@@ -23,12 +23,6 @@
 - include: set_facts.yml
   tags: facts
 
-- include: set_resolv_facts.yml
-  tags: [bootstrap-os, resolvconf, facts]
-
-- include: set_uid_facts.yml
-  tags: [bootstrap-os, facts]
-
 - name: gather os specific variables
   include_vars: "{{ item }}"
   with_first_found:
@@ -48,7 +42,7 @@
   file:
     path: "{{ kube_config_dir }}"
     state: directory
-    owner: "{{ kubelet_user }}"
+    owner: kube
   when: "{{ inventory_hostname in groups['k8s-cluster'] }}"
   tags: [kubelet, k8s-secrets, kube-controller-manager, kube-apiserver, bootstrap-os, apps, network, master, node]
 
@@ -56,7 +50,7 @@
   file:
     path: "{{ kube_script_dir }}"
     state: directory
-    owner: "{{ kubelet_user }}"
+    owner: kube
   when: "{{ inventory_hostname in groups['k8s-cluster'] }}"
   tags: [k8s-secrets, bootstrap-os]
 
@@ -64,7 +58,7 @@
   file:
     path: "{{ kube_manifest_dir }}"
     state: directory
-    owner: "{{ kubelet_user }}"
+    owner: kube
   when: "{{ inventory_hostname in groups['k8s-cluster'] }}"
   tags: [kubelet, bootstrap-os, master, node]
 
@@ -86,7 +80,7 @@
   file:
     path: "{{ item }}"
     state: directory
-    owner: "{{ kubelet_user }}"
+    owner: kube
   with_items:
     - "/etc/cni/net.d"
     - "/opt/cni/bin"

roles/kubernetes/preinstall/tasks/set_facts.yml

@@ -51,3 +51,6 @@
     etcd_container_bin_dir: "{% if etcd_after_v3 %}/usr/local/bin/{% else %}/{% endif %}"
 - set_fact:
     peer_with_calico_rr: "{{ 'calico-rr' in groups and groups['calico-rr']|length > 0 }}"
+
+- include: set_resolv_facts.yml
+  tags: [bootstrap-os, resolvconf, facts]

roles/kubernetes/preinstall/tasks/set_uid_facts.yml

@@ -1,32 +0,0 @@
----
-- name: Preinstall | get kube user ID
-  shell: /usr/bin/id -u {{ kubelet_user }} || echo 0
-  register: kube_uid
-
-- name: Preinstall | get kube group ID
-  shell: /usr/bin/id -g {{ kubelet_group }} || echo 0
-  register: kube_gid
-
-- name: Preinstall | get kube cert group ID
-  shell: /usr/bin/id -g {{ kube_cert_group }} || echo 0
-  register: kube_cert_gid
-
-- name: Preinstall | get etcd cert group ID
-  shell: /usr/bin/id -g {{ etcd_cert_group }} || echo 0
-  register: etcd_cert_gid
-
-- name: Preinstall | get netplug user ID
-  shell: /usr/bin/id -u {{ netplug_user }} || echo 0
-  register: netplug_uid
-
-- name: Preinstall | get netplug group ID
-  shell: /usr/bin/getent group {{ netplug_group }} | cut -d':' -f3 || echo 0
-  register: netplug_gid
-
-- set_fact:
-    kubelet_user_id: "{{ kube_uid.stdout }}"
-    kubelet_group_id: "{{ kube_gid.stdout }}"
-    kube_cert_group_id: "{{ kube_cert_gid.stdout }}"
-    etcd_cert_group_id: "{{ etcd_cert_gid.stdout }}"
-    netplug_user_id: "{{ netplug_uid.stdout }}"
-    netplug_group_id: "{{ netplug_gid.stdout }}"

roles/kubernetes/secrets/files/make-ssl.sh

@@ -101,8 +101,5 @@ if [ -n "$HOSTS" ]; then
     done
 fi
 
-# Grant the group read access
-chmod g+r *.pem
-
 # Install certs
 mv *.pem ${SSLDIR}/

roles/kubernetes/secrets/tasks/gen_certs.yml

@@ -140,11 +140,11 @@
   file:
     path={{ kube_cert_dir }}
     group={{ kube_cert_group }}
-    owner={{ kubelet_user }}
+    owner=kube
     recurse=yes
 
-- name: Gen_certs | set shared group permissions on keys
-  shell: chmod 0640 {{ kube_cert_dir}}/*.pem
+- name: Gen_certs | set permissions on keys
+  shell: chmod 0600 {{ kube_cert_dir}}/*key.pem
   when: inventory_hostname in groups['kube-master']
   changed_when: false
 

roles/kubernetes/secrets/tasks/main.yml

@@ -9,7 +9,6 @@
     path={{ kube_cert_dir }}
     state=directory
     mode=o-rwx
-    owner={{ kubelet_user }}
     group={{ kube_cert_group }}
 
 - name: Make sure the tokens directory exits
@@ -17,16 +16,14 @@
     path={{ kube_token_dir }}
     state=directory
     mode=o-rwx
-    owner={{ kubelet_user }}
-    group={{ kubelet_group }}
+    group={{ kube_cert_group }}
 
 - name: Make sure the users directory exits
   file:
     path={{ kube_users_dir }}
     state=directory
     mode=o-rwx
-    owner={{ kubelet_user }}
-    group={{ kubelet_group }}
+    group={{ kube_cert_group }}
 
 - name: Populate users for basic auth in API
   lineinfile:

roles/network_plugin/calico/defaults/main.yml

@@ -20,23 +20,6 @@ global_as_num: "64512"
 # defaults. The value should be a number, not a string.
 # calico_mtu: 1500
 
-# Linux capabilities to be dropped for container engines
-calico_drop_cap:
-  - chown
-  - dac_override
-  - fowner
-  - fsetid
-  - kill
-  - setgid
-  - setuid
-  - setpcap
-  - net_bind_service
-  - net_raw
-  - sys_chroot
-  - mknod
-  - audit_write
-  - setfcap
-
 # Limits for apps
 calico_node_memory_limit: 500M
 calico_node_cpu_limit: 300m

roles/network_plugin/calico/rr/tasks/main.yml

@@ -12,8 +12,8 @@
     dest: "{{ calico_cert_dir }}"
     state: directory
     mode: 0750
-    owner: "{{ netplug_user }}"
-    group: "{{ netplug_group }}"
+    owner: root
+    group: root
 
 - name: Calico-rr | Link etcd certificates for calico-node
   file:
@@ -31,8 +31,8 @@
     path: /var/log/calico-rr
     state: directory
     mode: 0755
-    owner: "{{ netplug_user }}"
-    group: "{{ netplug_group }}"
+    owner: root
+    group: root
 
 - name: Calico-rr | Write calico-rr.env for systemd init file
   template: src=calico-rr.env.j2 dest=/etc/calico/calico-rr.env

roles/network_plugin/calico/rr/templates/calico-rr.service.j2

@@ -6,7 +6,7 @@ Requires=docker.service
 [Service]
 EnvironmentFile=/etc/calico/calico-rr.env
 ExecStartPre=-{{ docker_bin_dir }}/docker rm -f calico-rr
-ExecStart={{ docker_bin_dir }}/docker run --net=host \
+ExecStart={{ docker_bin_dir }}/docker run --net=host --privileged \
  --name=calico-rr \
  -e IP=${IP} \
  -e IP6=${IP6} \
@@ -16,10 +16,6 @@ ExecStart={{ docker_bin_dir }}/docker run --net=host \
  -e ETCD_KEY_FILE=${ETCD_KEY_FILE} \
  -v /var/log/calico-rr:/var/log/calico \
  -v {{ calico_cert_dir }}:{{ calico_cert_dir }}:ro \
-{% for c in calico_drop_cap %}
- --cap-drop={{ c }} \
-{% endfor %}
- -u {{ netplug_user_id }}:{{ netplug_group_id }} --group-add {{ etcd_cert_group }} \
  --memory={{ calico_rr_memory_limit|regex_replace('Mi', 'M') }} --cpu-shares={{ calico_rr_cpu_limit|regex_replace('m', '') }} \
  {{ calico_rr_image_repo }}:{{ calico_rr_image_tag }}
 

roles/network_plugin/calico/tasks/main.yml

@@ -9,16 +9,15 @@
   template:
     src: "cni-calico.conf.j2"
     dest: "/etc/cni/net.d/10-calico.conf"
-    owner: "{{ kubelet_user }}"
-    group: "{{ kubelet_group }}"
+    owner: kube
 
 - name: Calico | Create calico certs directory
   file:
     dest: "{{ calico_cert_dir }}"
     state: directory
     mode: 0750
-    owner: "{{ netplug_user }}"
-    group: "{{ netplug_group }}"
+    owner: root
+    group: root
 
 - name: Calico | Link etcd certificates for calico-node
   file:

roles/network_plugin/canal/tasks/main.yml

@@ -3,16 +3,15 @@
   template:
     src: "cni-canal.conf.j2"
     dest: "/etc/cni/net.d/10-canal.conf"
-    owner: "{{ kubelet_user }}"
-    group: "{{ kubelet_group }}"
+    owner: kube
 
 - name: Canal | Create canal certs directory
   file:
     dest: "{{ canal_cert_dir }}"
     state: directory
     mode: 0750
-    owner: "{{ netplug_user }}"
-    group: "{{ netplug_group }}"
+    owner: root
+    group: root
 
 - name: Canal | Link etcd certificates for canal-node
   file: