jepsen注入网络故障，报"STDERR: iptables v1.4.7: option `-w' requires an argument"错误的解决方案

错误信息：

WARN [2020-06-08 15:08:44,867] main - jepsen.core Test crashed!
clojure.lang.ExceptionInfo: Command exited with non-zero status 2 on node 192.168.69.23:
sudo -S -u root bash -c "cd /; iptables -F -w"

STDIN:
null

STDOUT:


STDERR:
iptables v1.4.7: option `-w' requires an argument
Try `iptables -h' or 'iptables --help' for more information.

    at slingshot.support$stack_trace.invoke(support.clj:201) ~[knossos-0.3.5.jar:na]
    at jepsen.control$throw_on_nonzero_exit.invokeStatic(control.clj:126) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at jepsen.control$throw_on_nonzero_exit.invoke(control.clj:121) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at jepsen.control$exec_STAR_.invokeStatic(control.clj:170) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at jepsen.control$exec_STAR_.doInvoke(control.clj:167) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at clojure.lang.RestFn.applyTo(RestFn.java:137) ~[clojure-1.10.0.jar:na]
    at clojure.core$apply.invokeStatic(core.clj:665) ~[clojure-1.10.0.jar:na]
    at clojure.core$apply.invoke(core.clj:660) ~[clojure-1.10.0.jar:na]
    at jepsen.control$exec.invokeStatic(control.clj:186) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at jepsen.control$exec.doInvoke(control.clj:180) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at clojure.lang.RestFn.invoke(RestFn.java:436) ~[clojure-1.10.0.jar:na]
    at jepsen.net$reify__5189$fn__5191.invoke(net.clj:67) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at jepsen.control$on_nodes$fn__2919.invoke(control.clj:398) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at clojure.lang.AFn.applyToHelper(AFn.java:154) ~[clojure-1.10.0.jar:na]
    at clojure.lang.AFn.applyTo(AFn.java:144) ~[clojure-1.10.0.jar:na]
    at clojure.core$apply.invokeStatic(core.clj:665) ~[clojure-1.10.0.jar:na]
    at clojure.core$with_bindings_STAR_.invokeStatic(core.clj:1973) ~[clojure-1.10.0.jar:na]
    at clojure.core$with_bindings_STAR_.doInvoke(core.clj:1973) ~[clojure-1.10.0.jar:na]
    at clojure.lang.RestFn.applyTo(RestFn.java:142) ~[clojure-1.10.0.jar:na]
    at clojure.core$apply.invokeStatic(core.clj:669) ~[clojure-1.10.0.jar:na]
    at clojure.core$bound_fn_STAR_$fn__5734.doInvoke(core.clj:2003) ~[clojure-1.10.0.jar:na]
    at clojure.lang.RestFn.invoke(RestFn.java:408) ~[clojure-1.10.0.jar:na]
    at dom_top.core$real_pmap_helper$build_thread__214$fn__215.invoke(core.clj:146) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at clojure.lang.AFn.applyToHelper(AFn.java:152) ~[clojure-1.10.0.jar:na]
    at clojure.lang.AFn.applyTo(AFn.java:144) ~[clojure-1.10.0.jar:na]
    at clojure.core$apply.invokeStatic(core.clj:665) ~[clojure-1.10.0.jar:na]
    at clojure.core$with_bindings_STAR_.invokeStatic(core.clj:1973) ~[clojure-1.10.0.jar:na]
    at clojure.core$with_bindings_STAR_.doInvoke(core.clj:1973) ~[clojure-1.10.0.jar:na]
    at clojure.lang.RestFn.invoke(RestFn.java:425) ~[clojure-1.10.0.jar:na]
    at clojure.lang.AFn.applyToHelper(AFn.java:156) ~[clojure-1.10.0.jar:na]
    at clojure.lang.RestFn.applyTo(RestFn.java:132) ~[clojure-1.10.0.jar:na]
    at clojure.core$apply.invokeStatic(core.clj:669) ~[clojure-1.10.0.jar:na]
    at clojure.core$bound_fn_STAR_$fn__5734.doInvoke(core.clj:2003) ~[clojure-1.10.0.jar:na]
    at clojure.lang.RestFn.invoke(RestFn.java:397) ~[clojure-1.10.0.jar:na]
    at clojure.lang.AFn.run(AFn.java:22) ~[clojure-1.10.0.jar:na]
    at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_66]
ERROR [2020-06-08 15:08:44,874] main - jepsen.cli Oh jeez, I'm sorry, Jepsen broke. Here's why:
clojure.lang.ExceptionInfo: Command exited with non-zero status 2 on node 192.168.69.23:
sudo -S -u root bash -c "cd /; iptables -F -w"

STDIN:
null

STDOUT:


STDERR:
iptables v1.4.7: option `-w' requires an argument
Try `iptables -h' or 'iptables --help' for more information.

    at slingshot.support$stack_trace.invoke(support.clj:201) ~[knossos-0.3.5.jar:na]
    at jepsen.control$throw_on_nonzero_exit.invokeStatic(control.clj:126) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at jepsen.control$throw_on_nonzero_exit.invoke(control.clj:121) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at jepsen.control$exec_STAR_.invokeStatic(control.clj:170) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at jepsen.control$exec_STAR_.doInvoke(control.clj:167) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at clojure.lang.RestFn.applyTo(RestFn.java:137) ~[clojure-1.10.0.jar:na]
    at clojure.core$apply.invokeStatic(core.clj:665) ~[clojure-1.10.0.jar:na]
    at clojure.core$apply.invoke(core.clj:660) ~[clojure-1.10.0.jar:na]
    at jepsen.control$exec.invokeStatic(control.clj:186) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at jepsen.control$exec.doInvoke(control.clj:180) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at clojure.lang.RestFn.invoke(RestFn.java:436) ~[clojure-1.10.0.jar:na]
    at jepsen.net$reify__5189$fn__5191.invoke(net.clj:67) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at jepsen.control$on_nodes$fn__2919.invoke(control.clj:398) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at clojure.lang.AFn.applyToHelper(AFn.java:154) ~[clojure-1.10.0.jar:na]
    at clojure.lang.AFn.applyTo(AFn.java:144) ~[clojure-1.10.0.jar:na]
    at clojure.core$apply.invokeStatic(core.clj:665) ~[clojure-1.10.0.jar:na]
    at clojure.core$with_bindings_STAR_.invokeStatic(core.clj:1973) ~[clojure-1.10.0.jar:na]
    at clojure.core$with_bindings_STAR_.doInvoke(core.clj:1973) ~[clojure-1.10.0.jar:na]
    at clojure.lang.RestFn.applyTo(RestFn.java:142) ~[clojure-1.10.0.jar:na]
    at clojure.core$apply.invokeStatic(core.clj:669) ~[clojure-1.10.0.jar:na]
    at clojure.core$bound_fn_STAR_$fn__5734.doInvoke(core.clj:2003) ~[clojure-1.10.0.jar:na]
    at clojure.lang.RestFn.invoke(RestFn.java:408) ~[clojure-1.10.0.jar:na]
    at dom_top.core$real_pmap_helper$build_thread__214$fn__215.invoke(core.clj:146) ~[jepsen-0.1.15-SNAPSHOT.jar:na]
    at clojure.lang.AFn.applyToHelper(AFn.java:152) ~[clojure-1.10.0.jar:na]
    at clojure.lang.AFn.applyTo(AFn.java:144) ~[clojure-1.10.0.jar:na]
    at clojure.core$apply.invokeStatic(core.clj:665) ~[clojure-1.10.0.jar:na]
    at clojure.core$with_bindings_STAR_.invokeStatic(core.clj:1973) ~[clojure-1.10.0.jar:na]
    at clojure.core$with_bindings_STAR_.doInvoke(core.clj:1973) ~[clojure-1.10.0.jar:na]
    at clojure.lang.RestFn.invoke(RestFn.java:425) ~[clojure-1.10.0.jar:na]
    at clojure.lang.AFn.applyToHelper(AFn.java:156) ~[clojure-1.10.0.jar:na]
    at clojure.lang.RestFn.applyTo(RestFn.java:132) ~[clojure-1.10.0.jar:na]
    at clojure.core$apply.invokeStatic(core.clj:669) ~[clojure-1.10.0.jar:na]
    at clojure.core$bound_fn_STAR_$fn__5734.doInvoke(core.clj:2003) ~[clojure-1.10.0.jar:na]
    at clojure.lang.RestFn.invoke(RestFn.java:397) ~[clojure-1.10.0.jar:na]
    at clojure.lang.AFn.run(AFn.java:22) ~[clojure-1.10.0.jar:na]
    at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_66]

经过查询资料，发现是iptables 的1.4.7版本没有-w的参数，该参数是在1.4.20版本中加入的，所以需要升级iptables的版本至1.4.20以上。

升级办法：
centos6 升级防火墙iptables 1.4.21

另外需要注意：
jepsen的control节点和所有DB节点都需要同时升级。