cgroup_namespaces.7: ffix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man7/cgroup_namespaces.7

@@ -71,6 +71,7 @@ First, (as superuser) we create a child cgroup in the
 .I freezer
 hierarchy, and put the shell into that cgroup:
 .PP
+.EX
 .nf
 .in +4n
 # \fBmkdir \-p /sys/fs/cgroup/freezer/sub\fP
@@ -81,15 +82,18 @@ hierarchy, and put the shell into that cgroup:
 7:freezer:/sub
 .in
 .fi
+.EE
 .PP
 Next, we use
 .BR unshare (1)
 to create a process running a new shell in new cgroup and mount namespaces:
 .PP
 .nf
+.EX
 .in +4n
 # \fBunshare \-Cm bash\fP
 .in
+.EE
 .fi
 .PP
 We then inspect the
@@ -102,6 +106,7 @@ with PID 1), and a process in a sibling cgroup
 .RI ( sub2 ):
 .PP
 .nf
+.EX
 .in +4n
 $ \fBcat /proc/self/cgroup | grep freezer\fP
 7:freezer:/
@@ -110,6 +115,7 @@ $ \fBcat /proc/1/cgroup | grep freezer\fP
 $ \fBcat /proc/20124/cgroup | grep freezer\fP
 7:freezer:/../sub2
 .in
+.EE
 .fi
 .PP
 From the output of the first command,
@@ -131,10 +137,12 @@ However, when we look in
 we see the following anomaly:
 .PP
 .nf
+.EX
 .in +4n
 # \fBcat /proc/self/mountinfo | grep freezer\fP
 155 145 0:32 /.. /sys/fs/cgroup/freezer ...
 .in
+.EE
 .fi
 .PP
 The fourth field of this line
@@ -152,6 +160,7 @@ We need to remount the freezer cgroup filesystem
 inside this cgroup namespace, after which we see the expected results:
 .PP
 .nf
+.EX
 .in +4n
 # \fBmount \-\-make\-rslave /\fP     # Don't propagate mount events
                             # to other namespaces
@@ -160,6 +169,7 @@ inside this cgroup namespace, after which we see the expected results:
 # \fBcat /proc/self/mountinfo | grep freezer\fP
 155 145 0:32 / /sys/fs/cgroup/freezer rw,relatime ...
 .in
+.EE
 .fi
 .PP
 Use of cgroup namespaces requires a kernel that is configured with the